I need a function to multiply a matrix by a scaler.

struct _matrix { int rows; int cols; double * data; };

int nRows(matrix const * mtx, int * n) { if (!mtx || !n) return -1; *n = mtx->rows; return 0; }

int nCols(matrix const * mtx, int * n) { if (!mtx || !n) return -1; *n = mtx->cols; return 0; }

Exercise 6.10. Implement a function that sets a matrix to its product with a scalar: 1/Sets each element of mta to the product of that element * with s. Returns -1 if mtx is NULL and 0 otheru, ise. int scalarProduct (double s, matrix * mtx)