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- Function:
*int***gsl_vector_add***(gsl_vector **`a`, const gsl_vector *`b`) This function adds the elements of vector

`b`to the elements of vector`a`. The result*a_i \leftarrow a_i + b_i*is stored in`a`and`b`remains unchanged. The two vectors must have the same length.

- Function:
*int***gsl_vector_sub***(gsl_vector **`a`, const gsl_vector *`b`) This function subtracts the elements of vector

`b`from the elements of vector`a`. The result*a_i \leftarrow a_i - b_i*is stored in`a`and`b`remains unchanged. The two vectors must have the same length.

- Function:
*int***gsl_vector_mul***(gsl_vector **`a`, const gsl_vector *`b`) This function multiplies the elements of vector

`a`by the elements of vector`b`. The result*a_i \leftarrow a_i * b_i*is stored in`a`and`b`remains unchanged. The two vectors must have the same length.

- Function:
*int***gsl_vector_div***(gsl_vector **`a`, const gsl_vector *`b`) This function divides the elements of vector

`a`by the elements of vector`b`. The result*a_i \leftarrow a_i / b_i*is stored in`a`and`b`remains unchanged. The two vectors must have the same length.

- Function:
*int***gsl_vector_scale***(gsl_vector **`a`, const double`x`) This function multiplies the elements of vector

`a`by the constant factor`x`. The result*a_i \leftarrow x a_i*is stored in`a`.

- Function:
*int***gsl_vector_add_constant***(gsl_vector **`a`, const double`x`) This function adds the constant value

`x`to the elements of the vector`a`. The result*a_i \leftarrow a_i + x*is stored in`a`.