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Matrix solving program

Started by gritchie Oct 4, 2012 at 2:01 AM 0 replies 1.3k views

Original Post

Oct 4, 2012 at 2:01 AM

Hello everyone.

I was starting to make a program to solve the determinant of any nxn matrix.(just for the practice) I was wanting to use a class so I could practice using them. My question is should I use a data field for the size of the matrix and were would I start making my array (which i think would be the best way to make a matrix). I know I need to declare my array, I'm just not sure exactly where I should do that.

Thanks

alvaro

Oct 4, 2012 at 2:22 AM

"Solving" a matrix or a determinant doesn't mean anything. You can solve a system of linear equations (which can be expressed in matrix form) and you can compute a determinant. Precise language does matter for math, so try to learn to use the way people express these things.

This is how I would start a Matrix class:

#include <vector>
 
 class Matrix {
 int size;
 std::vector<double> m;
 
 public:
 Matrix(int size) : size(size), m(size*size) {
 }
 
 double &operator()(int row, int col) {
 return m[row * size + col];
 }
 
 double operator()(int row, int col) const {
 return m[row * size + col];
 }
 };

If the size of the matrix will be known at compile time, you have the option of using templates instead:

template <int size>
 class Matrix {
 double m[size*size];
 
 public:
 double &operator()(int row, int col) {
 return m[row * size + col];
 }
 
 double operator()(int row, int col) const {
 return m[row * size + col];
 }
 };

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