add hw3 solution
This commit is contained in:
JamesFlare1212
3
.vscode/settings.json
vendored
3
.vscode/settings.json
vendored
@@ -50,6 +50,7 @@
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"sstream": "cpp",
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"stdexcept": "cpp",
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"streambuf": "cpp",
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"typeinfo": "cpp"
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"typeinfo": "cpp",
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"cassert": "cpp"
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}
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}
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292
hws/matrix_class/Matrix.cpp
Normal file
292
hws/matrix_class/Matrix.cpp
Normal file
@@ -0,0 +1,292 @@
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#include "Matrix.h"
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#include <iostream>
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#include <iomanip>
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//helper function to allocate memory for a matrix of size r x c and fill it with "fill"
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void Matrix::allocateMemory(unsigned int r, unsigned int c, double fill) {
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if(r == 0 || c == 0) {
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rows = 0;
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cols = 0;
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data = nullptr;
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return;
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}
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rows = r;
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cols = c;
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data = new double*[rows];
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for (unsigned int i = 0; i < rows; i++) {
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data[i] = new double[cols];
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for (unsigned int j = 0; j < cols; j++) {
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data[i][j] = fill;
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}
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}
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}
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//helper function to deallocate memory
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void Matrix::deallocateMemory() {
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if(data != nullptr) {
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for (unsigned int i = 0; i < rows; i++) {
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delete [] data[i];
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}
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delete [] data;
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data = nullptr;
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}
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rows = 0;
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cols = 0;
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}
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//default constructor: creates an empty 0 x 0 matrix
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Matrix::Matrix() : rows(0), cols(0), data(nullptr) { }
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//parameterized constructor
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Matrix::Matrix(unsigned int r, unsigned int c, double fill) : rows(0), cols(0), data(nullptr) {
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allocateMemory(r, c, fill);
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}
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//copy constructor
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Matrix::Matrix(const Matrix& other) : rows(0), cols(0), data(nullptr) {
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allocateMemory(other.rows, other.cols, 0.0);
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for (unsigned int i = 0; i < rows; i++) {
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for (unsigned int j = 0; j < cols; j++) {
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data[i][j] = other.data[i][j];
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}
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}
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}
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//destructor
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Matrix::~Matrix() {
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deallocateMemory();
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}
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//assignment operator
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Matrix& Matrix::operator=(const Matrix& other) {
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if (this == &other)
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return *this;
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deallocateMemory();
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allocateMemory(other.rows, other.cols, 0.0);
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for (unsigned int i = 0; i < rows; i++) {
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for (unsigned int j = 0; j < cols; j++) {
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data[i][j] = other.data[i][j];
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}
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}
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return *this;
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}
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//returns the number of rows
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unsigned int Matrix::num_rows() const {
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return rows;
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}
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//returns the number of columns
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unsigned int Matrix::num_cols() const {
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return cols;
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}
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//clears the matrix by deallocating its memory
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void Matrix::clear() {
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deallocateMemory();
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}
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bool Matrix::get(unsigned int row, unsigned int col, double &value) const {
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if(row >= rows || col >= cols) {
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return false;
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}
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value = data[row][col];
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return true;
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}
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//modifier
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bool Matrix::set(unsigned int row, unsigned int col, double value) {
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if(row >= rows || col >= cols) {
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return false;
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}
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data[row][col] = value;
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return true;
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}
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//equality operator
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bool Matrix::operator==(const Matrix& other) const {
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//two matrices are equal if dimensions match
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//and every element is equal within a small epsilon
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if(rows != other.rows || cols != other.cols)
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return false;
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for (unsigned int i = 0; i < rows; i++) {
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for (unsigned int j = 0; j < cols; j++) {
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if (fabs(data[i][j] - other.data[i][j]) > 1e-10)
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return false;
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}
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}
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return true;
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}
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bool Matrix::operator!=(const Matrix& other) const {
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return !(*this == other);
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}
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//multiplies every element by the given coefficient
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void Matrix::multiply_by_coefficient(double coeff) {
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for (unsigned int i = 0; i < rows; i++) {
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for (unsigned int j = 0; j < cols; j++) {
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data[i][j] *= coeff;
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}
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}
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}
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//swaps two rows of the matrix (by swapping the row pointers)
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bool Matrix::swap_row(unsigned int row1, unsigned int row2) {
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if(row1 >= rows || row2 >= rows) {
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return false;
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}
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double* temp = data[row1];
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data[row1] = data[row2];
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data[row2] = temp;
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return true;
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}
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//transposes the matrix in place
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void Matrix::transpose() {
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if(rows == 0 || cols == 0)
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return;
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unsigned int newRows = cols;
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unsigned int newCols = rows;
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double** newData = new double*[newRows];
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for (unsigned int i = 0; i < newRows; i++) {
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newData[i] = new double[newCols];
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for (unsigned int j = 0; j < newCols; j++) {
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newData[i][j] = data[j][i];
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}
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}
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deallocateMemory();
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rows = newRows;
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cols = newCols;
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data = newData;
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}
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//adds another matrix to this one element-wise
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bool Matrix::add(const Matrix& other) {
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if(rows != other.rows || cols != other.cols)
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return false;
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for (unsigned int i = 0; i < rows; i++) {
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for (unsigned int j = 0; j < cols; j++) {
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data[i][j] += other.data[i][j];
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}
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}
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return true;
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}
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//subtracts another matrix from this one element-wise
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bool Matrix::subtract(const Matrix& other) {
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if(rows != other.rows || cols != other.cols)
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return false;
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for (unsigned int i = 0; i < rows; i++) {
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for (unsigned int j = 0; j < cols; j++) {
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data[i][j] -= other.data[i][j];
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}
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}
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return true;
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}
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//returns a dynamically allocated copy of the specified row
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//caller must delete[] the returned array
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double* Matrix::get_row(unsigned int row) const {
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if(row >= rows)
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return NULL;
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double* rowArray = new double[cols];
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for (unsigned int j = 0; j < cols; j++) {
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rowArray[j] = data[row][j];
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}
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return rowArray;
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}
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//returns a dynamically allocated copy of the specified column
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//caller must delete[] the returned array
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double* Matrix::get_col(unsigned int col) const {
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if(col >= cols)
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return NULL;
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double* colArray = new double[rows];
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for (unsigned int i = 0; i < rows; i++) {
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colArray[i] = data[i][col];
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}
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return colArray;
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}
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//divides the matrix into four quadrants and returns a pointer to an array of four matrices
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//each quadrant size = ceil(rows/2) x ceil(cols/2)
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Matrix* Matrix::quarter() const {
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if (rows == 0 || cols == 0) {
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return nullptr;
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}
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// Determine quadrant size so that all four quadrants are identical.
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// For overlapping, use ceil for both dimensions.
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unsigned int q_rows = (rows % 2 == 0) ? (rows / 2) : (rows / 2 + 1);
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unsigned int q_cols = (cols % 2 == 0) ? (cols / 2) : (cols / 2 + 1);
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// For an overlapping quarter, the top quadrants start at row 0,
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// the bottom quadrants start at floor(rows/2), similarly for columns.
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unsigned int start_row_bottom = rows / 2;
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unsigned int start_col_right = cols / 2;
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Matrix* quadrants = new Matrix[4]{
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Matrix(q_rows, q_cols, 0.0), // Upper Left
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Matrix(q_rows, q_cols, 0.0), // Upper Right
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Matrix(q_rows, q_cols, 0.0), // Lower Left
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Matrix(q_rows, q_cols, 0.0) // Lower Right
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};
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// Fill Upper Left quadrant from original (starting at (0,0)).
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for (unsigned int i = 0; i < q_rows; i++) {
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for (unsigned int j = 0; j < q_cols; j++) {
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double value;
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if (i < rows && j < cols && get(i, j, value))
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quadrants[0].set(i, j, value);
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}
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}
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// Fill Upper Right quadrant from original (starting at (0, start_col_right)).
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for (unsigned int i = 0; i < q_rows; i++) {
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for (unsigned int j = 0; j < q_cols; j++) {
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double value;
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if (i < rows && (j + start_col_right) < cols && get(i, j + start_col_right, value))
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quadrants[1].set(i, j, value);
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}
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}
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// Fill Lower Left quadrant from original (starting at (start_row_bottom, 0)).
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for (unsigned int i = 0; i < q_rows; i++) {
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for (unsigned int j = 0; j < q_cols; j++) {
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double value;
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if ((i + start_row_bottom) < rows && j < cols && get(i + start_row_bottom, j, value))
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quadrants[2].set(i, j, value);
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}
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}
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// Fill Lower Right quadrant from original (starting at (start_row_bottom, start_col_right)).
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for (unsigned int i = 0; i < q_rows; i++) {
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for (unsigned int j = 0; j < q_cols; j++) {
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double value;
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if ((i + start_row_bottom) < rows && (j + start_col_right) < cols &&
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get(i + start_row_bottom, j + start_col_right, value))
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quadrants[3].set(i, j, value);
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}
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}
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return quadrants;
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}
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//overloaded output operator to print the matrix
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// 4 x 4 matrix:
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// [ 14 14 14 14
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// 14 14 14 14
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// 14 9 14 14
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// 14 14 14 13 ]
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std::ostream& operator<<(std::ostream& out, const Matrix& m) {
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out << m.rows << " x " << m.cols << " matrix:" << std::endl;
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out << "[ ";
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for (unsigned int i = 0; i < m.rows; i++) {
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for (unsigned int j = 0; j < m.cols; j++) {
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out << m.data[i][j];
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if(j < m.cols - 1)
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out << " ";
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}
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if(i < m.rows - 1)
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out << std::endl << " ";
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}
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out << " ]";
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return out;
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}
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76
hws/matrix_class/Matrix.h
Normal file
76
hws/matrix_class/Matrix.h
Normal file
@@ -0,0 +1,76 @@
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#ifndef MATRIX_H
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#define MATRIX_H
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#include <iostream>
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#include <cmath>
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class Matrix {
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private:
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unsigned int rows;
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unsigned int cols;
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double** data;
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//allocate memory and fill with a given value
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void allocateMemory(unsigned int r, unsigned int c, double fill);
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//deallocate memory
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void deallocateMemory();
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public:
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////Constructors
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Matrix();
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Matrix(unsigned int r, unsigned int c, double fill);
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//copy constructor
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Matrix(const Matrix& other);
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////Destructor
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~Matrix();
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////Accessors
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Matrix& operator=(const Matrix& other);
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unsigned int num_rows() const;
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unsigned int num_cols() const;
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//deallocates memory and resets rows/cols to 0)
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void clear();
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//if (row, col) is within bounds, stores the element in `value` and returns true;
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//otherwise, returns false
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bool get(unsigned int row, unsigned int col, double &value) const;
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////Modifier
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//if (row, col) is within bounds, sets the element to `value` and returns true;
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//otherwise, returns false.
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bool set(unsigned int row, unsigned int col, double value);
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//multiplies every element in the matrix by the provided coefficient
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void multiply_by_coefficient(double coeff);
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//swaps two rows of the matrix. Returns true if both indices are valid,
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//false otherwise
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bool swap_row(unsigned int row1, unsigned int row2);
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//transposes the matrix in place (switches rows and columns).
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void transpose();
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//adds another matrix to this one element-wise (if dimensions match) and returns true;
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//otherwise, returns false.
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bool add(const Matrix& other);
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//subtracts another matrix from this one element-wise (if dimensions match)
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//and returns true; otherwise, returns false.
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bool subtract(const Matrix& other);
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//returns a new dynamically allocated array (of size num_cols)
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//containing the elements in the specified row.
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double* get_row(unsigned int row) const;
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//returns a new dynamically allocated array (of size num_rows)
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//containing the elements in the specified column.
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double* get_col(unsigned int col) const;
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//divides the matrix into four quadrants and returns a pointer to an array of
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//4 Matrix objects: Upper Left, Upper Right, Lower Left, Lower Right.
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//each quadrant is of size ceil(rows/2) x ceil(cols/2)
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//and the quadrants overlap when the dimensions are odd.
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Matrix* quarter() const;
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////Operators
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//equality operator: two matrices are equal if they have the same dimensions and
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//every corresponding element differs by no more than a small epsilon.
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bool operator==(const Matrix& other) const;
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//inequality operator
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bool operator!=(const Matrix& other) const;
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//overloaded output operator for printing the matrix
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friend std::ostream& operator<<(std::ostream& out, const Matrix& m);
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};
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#endif
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@@ -1,7 +1,7 @@
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HOMEWORK 3: MATRIX CLASS
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NAME: < insert name >
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NAME: Jinshan Zhou
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COLLABORATORS AND OTHER RESOURCES:
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@@ -10,13 +10,13 @@ List the names of everyone you talked to about this assignment
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LMS, etc.), and all of the resources (books, online reference
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material, etc.) you consulted in completing this assignment.
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< insert collaborators / resources >
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cmath fabs method. Lecture notes about ** pointers and destructors.
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Remember: Your implementation for this assignment must be done on your
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own, as described in "Academic Integrity for Homework" handout.
|
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ESTIMATE OF # OF HOURS SPENT ON THIS ASSIGNMENT: < insert # hours >
|
||||
ESTIMATE OF # OF HOURS SPENT ON THIS ASSIGNMENT: 14 hr
|
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@@ -27,25 +27,25 @@ number of columns. You should assume that calling new [] or delete []
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on an array will take time proportional to the number of elements in
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the array.
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get
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get -> O(1)
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set
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set -> O(1)
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num_rows
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num_rows -> O(1)
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get_column
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get_column -> O(m)
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operator<<
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operator<< -> O(m*n)
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quarter
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quarter -> O(m*n)
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||||
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operator==
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operator== -> O(m*n)
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||||
|
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operator!=
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operator!= -> O(m*n)
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||||
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swap_rows
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swap_rows -> O(1)
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||||
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||||
rref (provided in matrix_main.cpp)
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rref (provided in matrix_main.cpp) -> O(m^2 * n)
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||||
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||||
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||||
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||||
@@ -55,6 +55,17 @@ What tools did you use (gdb/lldb/Visual Studio debugger,
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Valgrind/Dr. Memory, std::cout & print, etc.)? How did you test the
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"corner cases" of your Matrix class design & implementation?
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I used gdb inside VSCode to debug my program. I also used the information
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from the submitty autograder (Dr. Memory) to help me find bugs in my code.
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I basiclly find what's name and function of the methods of Martix class,
|
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and change my code bit by bit to fit the expected output.
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MISC. COMMENTS TO GRADER:
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(optional, please be concise!)
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||||
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||||
REFLECTION:
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As the pointer adding up, the complexity of the program will increase.
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||||
I think it is important to understand where do pointers points to and
|
||||
delete them when they are not needed anymore. It's quiet tricky and I
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||||
got a lot of memory leaks in my code at first. But the error message in
|
||||
Dr. Memory shows which line caused the problem, so I was able to fix it.
|
||||
@@ -33,10 +33,8 @@ int main(){
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std::cout << "Completed all simple tests." << std::endl;
|
||||
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||||
//Uncomment this to allocate a lot of 100x100 matrices so leaks will be bigger.
|
||||
/*
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||||
BatchTest(100,0.1,100,100,50);
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||||
std::cout << "Completed all batch tests." << std::endl;
|
||||
*/
|
||||
|
||||
StudentTest();
|
||||
std::cout << "Completed all student tests." << std::endl;
|
||||
@@ -200,8 +198,126 @@ void SimpleTest(){ //well behaved getrow/read after
|
||||
|
||||
//Write your own test cases here
|
||||
void StudentTest() {
|
||||
//Test transpose
|
||||
Matrix m(2, 3, 0);
|
||||
m.set(0, 0, 1);
|
||||
m.set(0, 1, 2);
|
||||
m.set(0, 2, 3);
|
||||
m.set(1, 0, 4);
|
||||
m.set(1, 1, 5);
|
||||
m.set(1, 2, 6);
|
||||
m.transpose();
|
||||
assert(m.num_rows() == 3);
|
||||
assert(m.num_cols() == 2);
|
||||
double val;
|
||||
m.get(0, 0, val);
|
||||
assert(double_compare(val, 1.0));
|
||||
m.get(0, 1, val);
|
||||
assert(double_compare(val, 4.0));
|
||||
m.get(1, 0, val);
|
||||
assert(double_compare(val, 2.0));
|
||||
m.get(2, 1, val);
|
||||
assert(double_compare(val, 6.0));
|
||||
|
||||
//Test quarter with odd dimensions
|
||||
Matrix q(5, 5, 1);
|
||||
Matrix* quarters = q.quarter();
|
||||
assert(quarters != nullptr);
|
||||
//each quadrant should be 3x3 (ceiling: (5+1)/2 == 3)
|
||||
assert(quarters[0].num_rows() == 3);
|
||||
assert(quarters[0].num_cols() == 3);
|
||||
assert(quarters[1].num_rows() == 3);
|
||||
assert(quarters[1].num_cols() == 3);
|
||||
assert(quarters[2].num_rows() == 3);
|
||||
assert(quarters[2].num_cols() == 3);
|
||||
assert(quarters[3].num_rows() == 3);
|
||||
assert(quarters[3].num_cols() == 3);
|
||||
//verify that the quadrants hold the expected values.
|
||||
for (int i = 0; i < 3; i++) {
|
||||
for (int j = 0; j < 3; j++) {
|
||||
quarters[0].get(i, j, val);
|
||||
assert(double_compare(val, 1.0));
|
||||
quarters[1].get(i, j, val);
|
||||
assert(double_compare(val, 1.0));
|
||||
quarters[2].get(i, j, val);
|
||||
assert(double_compare(val, 1.0));
|
||||
quarters[3].get(i, j, val);
|
||||
assert(double_compare(val, 1.0));
|
||||
}
|
||||
}
|
||||
delete[] quarters;
|
||||
|
||||
//Test add and subtract
|
||||
Matrix a(2, 2, 2);
|
||||
Matrix b(2, 2, 3);
|
||||
assert(a.add(b)); // Now a is all 5's.
|
||||
double v;
|
||||
a.get(0, 0, v);
|
||||
assert(double_compare(v, 5.0));
|
||||
assert(a.subtract(b)); // Now a is back to all 2's.
|
||||
a.get(0, 0, v);
|
||||
assert(double_compare(v, 2.0));
|
||||
|
||||
//Test multiply by coefficient
|
||||
a.multiply_by_coefficient(2.5); //Now a is all 5's (2*2.5).
|
||||
a.get(0, 0, v);
|
||||
assert(double_compare(v, 5.0));
|
||||
|
||||
//Test get_row
|
||||
double* row = a.get_row(0);
|
||||
assert(row != nullptr);
|
||||
assert(double_compare(row[0], 5.0));
|
||||
assert(double_compare(row[1], 5.0));
|
||||
delete[] row;
|
||||
|
||||
// Test get_col
|
||||
double* col = a.get_col(1);
|
||||
assert(col != nullptr);
|
||||
assert(double_compare(col[0], 5.0));
|
||||
assert(double_compare(col[1], 5.0));
|
||||
delete[] col;
|
||||
|
||||
//Test clear
|
||||
a.clear();
|
||||
assert(a.num_rows() == 0 && a.num_cols() == 0);
|
||||
|
||||
//Test swap_row
|
||||
Matrix s(3, 2, 0);
|
||||
s.set(0, 0, 1); s.set(0, 1, 2);
|
||||
s.set(1, 0, 3); s.set(1, 1, 4);
|
||||
s.set(2, 0, 5); s.set(2, 1, 6);
|
||||
//swap row 0 and row 2
|
||||
assert(s.swap_row(0, 2));
|
||||
s.get(0, 0, val);
|
||||
assert(double_compare(val, 5.0));
|
||||
s.get(0, 1, val);
|
||||
assert(double_compare(val, 6.0));
|
||||
s.get(2, 0, val);
|
||||
assert(double_compare(val, 1.0));
|
||||
s.get(2, 1, val);
|
||||
assert(double_compare(val, 2.0));
|
||||
//invalid swap should return false.
|
||||
assert(!s.swap_row(0, 3));
|
||||
|
||||
//Test copy constructor and assignment operator.
|
||||
Matrix orig(2, 3, 7);
|
||||
Matrix copy(orig); // Using copy constructor.
|
||||
Matrix assign;
|
||||
assign = orig; // Using assignment operator.
|
||||
//change orig to ensure copy and assign remain unchanged.
|
||||
orig.set(0, 0, 10);
|
||||
orig.get(0, 0, val);
|
||||
assert(double_compare(val, 10.0));
|
||||
copy.get(0, 0, val);
|
||||
assert(double_compare(val, 7.0));
|
||||
assign.get(0, 0, val);
|
||||
assert(double_compare(val, 7.0));
|
||||
|
||||
//Test out-of-bound get and set
|
||||
assert(!orig.get(5, 5, val));
|
||||
assert(!orig.set(5, 5, 3.0));
|
||||
}
|
||||
|
||||
|
||||
////////////////Utility functions//////////////////////
|
||||
|
||||
|
||||
Reference in New Issue
Block a user