Topic: Matrix proxy class (first draft)
Due: 11:59pm Tuesday, 4 April 2012

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

Introduction

In class, we have begun discussions of what it might take to provide support for using ranges to describe submatrices in expressions that mutate the original matrix. For example, we would like support for behaviors such as

A(range(3,5), range(4,8)) = B;     // assuming B is matrix with proper size

Unfortunately, our initial solution is incomplete. Here are some examples of syntaxes that are still illegal with our current codebase:

  cout << A(2, range(3,2,9)) + A(4, range(0,3)) << endl;   // add two submatrices with equal size
  cout << A(2, range(3,2,9)) + matrix(1,3,1) << endl;      // add a submatrix to some other matrix
  matrix B(A(range(0,2), range(0,4)));                     // create a new (independent) matrix based on a submatrix

Files we are providing

If working on turing, change directories into a desired subdirectory of your home folder if desired, and to execute the following command verbatim

  cp -R /Public/goldwasser/146/asgn07 .

We have changed our codebase a bit from past assignments. In particular, we have divide the code across several additional files.

• matrix_proxy.h
  This contains the definition for our new matrix_proxy class. We will start you out with the version that we described during lecture. You will need to complete the implementation to support the additions.
• matrix.h
  This file now contains the formal declarations for the range and matrix classes. However, it no longer contains the implementations for the matrix functions. Those have been relocated to the file matrix.cpp. You may edit this as necessary.
• matrix.cpp
  This file now contains all of the matrix class method implementations, as well as the supporting code for supporting basic I/O for both matrix and matrix_proxy objects. You may edit this as necessary.
• test.cpp
  This is a simple driver allowing us to test the new functionality of our proxy class.
• sample.txt
  This is a sample of an input file for use with the test driver.
• 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

Attach an updated version of any files that you modify, together with a readme.txt file that gives an overview of your changes, should be submitted electronically (details on the submission process).