The library provides functions for reading and writing permutations to a file as binary data or formatted text.

__Function:__int**gsl_permutation_fwrite***(FILE **`stream`, const gsl_permutation *`p`)-
This function writes the elements of the permutation
`p`to the stream`stream`in binary format. The function returns`GSL_EFAILED`

if there was a problem writing to the file. Since the data is written in the native binary format it may not be portable between different architectures.

__Function:__int**gsl_permutation_fread***(FILE **`stream`, gsl_permutation *`p`)-
This function reads into the permutation
`p`from the open stream`stream`in binary format. The permutation`p`must be preallocated with the correct length since the function uses the size of`p`to determine how many bytes to read. The function returns`GSL_EFAILED`

if there was a problem reading from the file. The data is assumed to have been written in the native binary format on the same architecture.

__Function:__int**gsl_permutation_fprintf***(FILE **`stream`, const gsl_permutation *`p`, const char *`format`)-
This function writes the elements of the permutation
`p`line-by-line to the stream`stream`using the format specifier`format`, which should be suitable for a type of`size_t`. On a GNU system the type modifier`Z`

represents`size_t`

, so`"%Zu\n"`

is a suitable format. The function returns`GSL_EFAILED`

if there was a problem writing to the file.

__Function:__int**gsl_permutation_fscanf***(FILE **`stream`, gsl_permutation *`p`)-
This function reads formatted data from the stream
`stream`into the permutation`p`. The permutation`p`must be preallocated with the correct length since the function uses the size of`p`to determine how many numbers to read. The function returns`GSL_EFAILED`

if there was a problem reading from the file.

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