The following operations are only defined for real vectors.

__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`, @math{a'_i = a_i + b_i}. 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`, @math{a'_i = a_i - b_i}. 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`, @math{a'_i = a_i * b_i}. 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`, @math{a'_i = a_i / b_i}. 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`, @math{a'_i = x a_i}.

__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`, @math{a'_i = a_i + x}.

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