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- Function:
*int***gsl_spmatrix_add***(gsl_spmatrix **`c`, const gsl_spmatrix *`a`, const gsl_spmatrix *`b`) This function computes the sum

*c = a + b*. The three matrices must have the same dimensions and be stored in a compressed format.

- Function:
*int***gsl_spmatrix_scale***(gsl_spmatrix **`m`, const double`x`) This function scales all elements of the matrix

`m`by the constant factor`x`. The result*m(i,j) \leftarrow x m(i,j)*is stored in`m`.