Matrices Multiplication
Matrix Multiplication in C
/* ---------------------------------------------------------------------------- Function : multiplyMatrices Description : Multiply two matrices. Note: The resultmatrix can be reused for multiple matrix multiplications - no need to preintialize the array with '0'. ---------------------------------------------------------------------------- */ inline void multiplyMatrices(int matrixA[200][200], int aRows, int aCols, int matrixB[200][200], int bRows, int bCols, int resultMatrix[200][200]) { /* ---------------------------------------------------------------------*/ // Perform the matrix multiplication with the 'Einstein Summation' method /* ---------------------------------------------------------------------*/ int i, j, k, sum; for( i = 0; i < aRows; i++ ) { for( j = 0; j < bCols; j++ ) { for( k = 0, sum = 0; k < aCols; k++ ) { // Example: // [1 1] [1 1] // [2 2] [1 1] = [2 2] // [4 4] sum += matrixA[i][k] * matrixB[k][j]; } resultMatrix[i][j] = sum; } } }
Matrix Multiplication Methods
http://en.wikipedia.org/wiki/Matrix_multiplication
Matrix Problems/Exercises
http://ceee.rice.edu/Books/LA/mult/mult4.html#TOP
Matrix Multiplication - How To (Einstein summation method)
http://mathworld.wolfram.com/MatrixMultiplication.html
http://www.purplemath.com/modules/mtrxmult.htm
Matrix Multiplication in C (example)
http://www.edcc.edu/faculty/paul.bladek/Cmpsc142/matmult.htm
Online Matrix Multiplication
http://www.jimmysie.com/maths/matrix.php#a=mf&opname=multiply&r1=2&c1=2&r2=2&c2=1s
http://wims.unice.fr/wims/wims.cgi?session=6U014DD01E.2&+lang=en&+module=tool%2Flinear%2Fmatmult.en
Fastest Square Matrix Multiplication Algorithm
page revision: 3, last edited: 28 Oct 2007 13:19