matrix multiplication

[replax]

the program would have to do:

n=a*y+b*z and m=c*y+d*z

i figured that it has to be somewhat like this:

for(int nRo = 0; nRow < resmatrix.m_nRowCount; nRow++)
{
for(int nCol = 0; nCol < resmatrix.m_nColumnCount; nCol++)
{
now i have acces to the matrix element holding the resolution(n)
resmatrix.pfaMatrix[nRow * resmatrix.m_nColumnCount + nCol] = /*What should the equation be here*/
}
}

sorry for the screwed up double post.. no edit button.