Optimized matrix multiplication in C

Question

I\'m trying to compare different methods for matrix multiplication. The first one is normal method:

do
{
    for (j = 0; j < i; j++)
    {
        for (k          


        

Answer 1

not so special but better :

    c = 0;
do
{
    for (j = 0; j < i; j++)
    {
        for (k = 0; k < i; k++)
        {
            sum = 0; sum_ = 0;
            for (l = 0; l < i; l++) {
                MatrixB[j][k] = MatrixB[k][j];
                sum += MatrixA[j][l]*MatrixB[k][l];
                l++;
                MatrixB[j][k] = MatrixB[k][j];
                sum_ += MatrixA[j][l]*MatrixB[k][l];

                sum += sum_;
            }
            MatrixR[j][k] = sum;
        }
     }
     c++;
} while (c