The following function can be used to exchange, or permute, the elements of a vector.

__Function:__int**gsl_vector_swap_elements***(gsl_vector **`v`, size_t i, size_t j)-
This function exchanges the
`i`-th and`j`-th elements of the vector`v`in-place.

__Function:__int**gsl_vector_reverse***(gsl_vector **`v`)-
This function reverses the order of the elements of the vector
`v`.

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