GNU Scientific Library Reference Manual - Third Edition (v1.12)by M. Galassi, J. Davies, J. Theiler, B. Gough, G. Jungman, P. Alken, M. Booth, F. Rossi Paperback (6"x9"), 592 pages, 60 figures ISBN 0954612078 RRP £24.95 ($39.95) |

### 8.4.1 Matrix allocation

The functions for allocating memory to a matrix follow the style of
`malloc`

and `free`

. They also perform their own error
checking. If there is insufficient memory available to allocate a matrix
then the functions call the GSL error handler (with an error number of
`GSL_ENOMEM`

) in addition to returning a null pointer. Thus if you
use the library error handler to abort your program then it isn't
necessary to check every `alloc`

.

__Function:__gsl_matrix ***gsl_matrix_alloc***(size_t*`n1`, size_t`n2`)- This function creates a matrix of size
`n1`rows by`n2`columns, returning a pointer to a newly initialized matrix struct. A new block is allocated for the elements of the matrix, and stored in the`block`component of the matrix struct. The block is “owned” by the matrix, and will be deallocated when the matrix is deallocated.

__Function:__gsl_matrix ***gsl_matrix_calloc***(size_t*`n1`, size_t`n2`)- This function allocates memory for a matrix of size
`n1`rows by`n2`columns and initializes all the elements of the matrix to zero.

__Function:__void**gsl_matrix_free***(gsl_matrix **`m`)- This function frees a previously allocated matrix
`m`. If the matrix was created using`gsl_matrix_alloc`

then the block underlying the matrix will also be deallocated. If the matrix has been created from another object then the memory is still owned by that object and will not be deallocated. The matrix`m`must be a valid matrix object (a null pointer is not allowed).

ISBN 0954612078 | GNU Scientific Library Reference Manual - Third Edition (v1.12) | See the print edition |