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- Function:
*void***gsl_vector_set_all***(gsl_vector **`v`, double`x`) This function sets all the elements of the vector

`v`to the value`x`.

- Function:
*void***gsl_vector_set_zero***(gsl_vector **`v`) This function sets all the elements of the vector

`v`to zero.

- Function:
*int***gsl_vector_set_basis***(gsl_vector **`v`, size_t`i`) This function makes a basis vector by setting all the elements of the vector

`v`to zero except for the`i`-th element which is set to one.