Topic: Matrix Multiplication
Due: 11:59pm Tuesday, 20 September 2011

Please make sure you adhere to the policies on academic integrity.

Your task

In class, we gave an initial implementation of the matrix class that supported construction, indexing, and addition, as well as scalar multiplication. Your goal is to implement the function to support matrix multiplications. It has signature

  matrix operator*(const matrix& other) const

We are providing the basic framework for the matrix class, and a very simple driver named test that allows you to enter the name of a file that contains data for two matrices, separated by a blank line, and which reads those matrices and then tries to perform the appropriate additions and multiplications based upon the dimensions of those matrices.

Files we are providing

cp -R /Public/goldwasser/146/asgn03 .

• matrix.h
  This is the only file that you should edit. We will start you out with the version that we described during lecture. You will need to complete the implementation for matrix multiplication.
• matrixio.cpp
  This is some supporting code that we have written that provides reasonable I/O capabilities for the matrix class. In particular, it provides the functionality for printing a formatted matrix to an output stream, or reading data for a matrix from an input stream.
• test.cpp
  This is a simple driver allowing us to test the functionality of additions and multiplications.
• sample.txt
  This is a sample of an input file for use with the test driver. The file format should consist of two matrices, separated by a blank line.
• makefile
  This is a makefile for the project. If you type the command

        make
        

  it will attempt to compile your matrix code and the test driver. Assuming it compiles cleanly, you can execute the driver by subsequently typing

        ./test
        

Submitting your project

Your assignment should be submitted electronically (details on the submission process). The only file that I need from you is the source code matrix.h.