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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`.