The following functions can be used to exchange the rows and columns of a matrix.

__Function:__int**gsl_matrix_swap_rows***(gsl_matrix **`m`, size_t`i`, size_t`j`)-
This function exchanges the
`i`-th and`j`-th rows of the matrix`m`in-place.

__Function:__int**gsl_matrix_swap_columns***(gsl_matrix **`m`, size_t`i`, size_t`j`)-
This function exchanges the
`i`-th and`j`-th columns of the matrix`m`in-place.

__Function:__int**gsl_matrix_swap_rowcol***(gsl_matrix **`m`, size_t`i`, size_t`j`)-
This function exchanges the
`i`-th row and`j`-th column of the matrix`m`in-place. The matrix must be square for this operation to be possible.

__Function:__int**gsl_matrix_transpose_memcpy***(gsl_matrix **`dest`, gsl_matrix *`src`)-
This function makes the matrix
`dest`the transpose of the matrix`src`by copying the elements of`src`into`dest`. This function works for all matrices provided that the dimensions of the matrix`dest`match the transposed dimensions of the matrix`src`.

__Function:__int**gsl_matrix_transpose***(gsl_matrix **`m`)-
This function replaces the matrix
`m`by its transpose by copying the elements of the matrix in-place. The matrix must be square for this operation to be possible.

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