The following operations are only defined for real matrices.

__Function:__int**gsl_matrix_add***(gsl_matrix **`a`, const gsl_matrix *`b`)-
This function adds the elements of matrix
`b`to the elements of matrix`a`, @math{a'(i,j) = a(i,j) + b(i,j)}. The two matrices must have the same dimensions.

__Function:__int**gsl_matrix_sub***(gsl_matrix **`a`, const gsl_matrix *`b`)-
This function subtracts the elements of matrix
`b`from the elements of matrix`a`, @math{a'(i,j) = a(i,j) - b(i,j)}. The two matrices must have the same dimensions.

__Function:__int**gsl_matrix_mul_elements***(gsl_matrix **`a`, const gsl_matrix *`b`)-
This function multiplies the elements of matrix
`a`by the elements of matrix`b`, @math{a'(i,j) = a(i,j) * b(i,j)}. The two matrices must have the same dimensions.

__Function:__int**gsl_matrix_div_elements***(gsl_matrix **`a`, const gsl_matrix *`b`)-
This function divides the elements of matrix
`a`by the elements of matrix`b`, @math{a'(i,j) = a(i,j) / b(i,j)}. The two matrices must have the same dimensions.

__Function:__int**gsl_matrix_scale***(gsl_matrix **`a`, const double`x`)-
This function multiplies the elements of matrix
`a`by the constant factor`x`, @math{a'(i,j) = x a(i,j)}.

__Function:__int**gsl_matrix_add_constant***(gsl_matrix **`a`, const double`x`)-
This function adds the constant value
`x`to the elements of the matrix`a`, @math{a'(i,j) = a(i,j) + x}.

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