adding hw3 and move old hw3 to old hw folder

old_hws/03_matrix_class/README.txt

@@ -0,0 +1,60 @@
+HOMEWORK 3: MATRIX CLASS
+
+
+NAME:  < insert name >
+
+
+COLLABORATORS AND OTHER RESOURCES:
+List the names of everyone you talked to about this assignment
+(classmates, TAs, ALAC tutors, upperclassmen, students/instructor via
+LMS, etc.), and all of the resources (books, online reference
+material, etc.) you consulted in completing this assignment.
+
+< insert collaborators / resources >
+
+Remember: Your implementation for this assignment must be done on your
+own, as described in "Academic Integrity for Homework" handout.
+
+
+ESTIMATE OF # OF HOURS SPENT ON THIS ASSIGNMENT:  < insert # hours >
+
+
+
+ORDER NOTATION:
+For each of the functions below, write the order notation O().
+Write each answer in terms of m = the number of rows and n = the
+number of columns.  You should assume that calling new [] or delete []
+on an array will take time proportional to the number of elements in
+the array.
+
+get
+
+set
+
+num_rows
+
+get_column
+
+operator<<
+
+quarter
+
+operator==
+
+operator!=
+
+swap_rows
+
+rref (provided in matrix_main.cpp)
+
+
+
+TESTING & DEBUGGING STRATEGY: 
+Discuss your strategy for testing & debugging your program.  
+What tools did you use (gdb/lldb/Visual Studio debugger,
+Valgrind/Dr. Memory, std::cout & print, etc.)?  How did you test the
+"corner cases" of your Matrix class design & implementation?
+
+MISC. COMMENTS TO GRADER:  
+(optional, please be concise!)
+