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<h4 class="subsection">8.4.1 Matrix allocation</h4>
<p>The functions for allocating memory to a matrix follow the style of
<code>malloc</code> and <code>free</code>. They also perform their own error
checking. If there is insufficient memory available to allocate a vector
then the functions call the GSL error handler (with an error number of
<code>GSL_ENOMEM</code>) 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 <code>alloc</code>.
<div class="defun">
— Function: gsl_matrix * <b>gsl_matrix_alloc</b> (<var>size_t n1, size_t n2</var>)<var><a name="index-gsl_005fmatrix_005falloc-911"></a></var><br>
<blockquote><p>This function creates a matrix of size <var>n1</var> rows by <var>n2</var>
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
<var>block</var> component of the matrix struct. The block is “owned” by the
matrix, and will be deallocated when the matrix is deallocated.
</p></blockquote></div>
<div class="defun">
— Function: gsl_matrix * <b>gsl_matrix_calloc</b> (<var>size_t n1, size_t n2</var>)<var><a name="index-gsl_005fmatrix_005fcalloc-912"></a></var><br>
<blockquote><p>This function allocates memory for a matrix of size <var>n1</var> rows by
<var>n2</var> columns and initializes all the elements of the matrix to zero.
</p></blockquote></div>
<div class="defun">
— Function: void <b>gsl_matrix_free</b> (<var>gsl_matrix * m</var>)<var><a name="index-gsl_005fmatrix_005ffree-913"></a></var><br>
<blockquote><p>This function frees a previously allocated matrix <var>m</var>. If the
matrix was created using <code>gsl_matrix_alloc</code> 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 <var>m</var> must be a
valid matrix object (a null pointer is not allowed).
</p></blockquote></div>
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