Multiplying two matrices...

I need to multiply two N x N Matrices... Ive seen some sample code on some websites, but they are too complex..any sugestons on a which is the best way to do it?.. any samples?

Go to http://mathworld.wolfram.com/MatrixMultiplication.html. In there you will find an algorithm for multiplying any two matrices that can be multiplied.

If you know to multiply 2 matrices mathematically, it shouldn't be too hard to put in in C/C++.

Code:

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#define N1 ...
#define N2 ...
#define M ...

int A[N1][M], B[M][N2], C[N1][N2];
for(int i=0; i<N1; i++)
{
 for(int j=0; j<N2; j++)
 {
  C[i][j] = 0;
  for(k=0; k<M; k++)
    C[i][j] += A[i][k]*B[k][J];
 }
}

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Very simple... ;)

yeah i agree with cilu mostly
but i prefer this way if i had got the chance:

Code:

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const int M...
const int N...
const int MN...

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regards,
jolley

If you don't feel like writing your own matrix classes, you might try TNT:

http://math.nist.gov/tnt/

Quote:

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Originally Posted by jolley

but i prefer this way if i had got the chance:

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I was trying to show how to multiply two matrices, not how to declare their sizes.

oh..thanks for the links and thanks for the code guys!...I was looking for a simple code since the one I was writning was too complicated ..but now I get the idea ...I'lll be adding some more code to that to make it work the way I need... then I'll convert it to MIPS assembly...(thats why im looking for a simple code) once again.. thanks for you help guys! If you get any other ideas, please post.. thank you!.