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) |

## 11.2 Sorting vectors

The following functions will sort the elements of an array or vector,
either directly or indirectly. They are defined for all real and integer
types using the normal suffix rules. For example, the `float`

versions of the array functions are `gsl_sort_float`

and
`gsl_sort_float_index`

. The corresponding vector functions are
`gsl_sort_vector_float`

and `gsl_sort_vector_float_index`

. The
prototypes are available in the header files `‘gsl_sort_float.h’`
`‘gsl_sort_vector_float.h’`. The complete set of prototypes can be
included using the header files `‘gsl_sort.h’` and
`‘gsl_sort_vector.h’`.

There are no functions for sorting complex arrays or vectors, since the ordering of complex numbers is not uniquely defined. To sort a complex vector by magnitude compute a real vector containing the magnitudes of the complex elements, and sort this vector indirectly. The resulting index gives the appropriate ordering of the original complex vector.

__Function:__void**gsl_sort***(double **`data`, size_t`stride`, size_t`n`)- This function sorts the
`n`elements of the array`data`with stride`stride`into ascending numerical order.

__Function:__void**gsl_sort_vector***(gsl_vector **`v`)- This function sorts the elements of the vector
`v`into ascending numerical order.

__Function:__void**gsl_sort_index***(size_t **`p`, const double *`data`, size_t`stride`, size_t`n`)- This function indirectly sorts the
`n`elements of the array`data`with stride`stride`into ascending order, storing the resulting permutation in`p`. The array`p`must be allocated with a sufficient length to store the`n`elements of the permutation. The elements of`p`give the index of the array element which would have been stored in that position if the array had been sorted in place. The array`data`is not changed.

__Function:__int**gsl_sort_vector_index***(gsl_permutation **`p`, const gsl_vector *`v`)- This function indirectly sorts the elements of the vector
`v`into ascending order, storing the resulting permutation in`p`. The elements of`p`give the index of the vector element which would have been stored in that position if the vector had been sorted in place. The first element of`p`gives the index of the least element in`v`, and the last element of`p`gives the index of the greatest element in`v`. The vector`v`is not changed.

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