Vector properties - GNU Scientific Library -- Reference Manual
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#### 8.3.10 Vector properties

The following functions are defined for real and complex vectors. For complex vectors both the real and imaginary parts must satisfy the conditions.

— Function: int gsl_vector_isnull (const gsl_vector * v)
— Function: int gsl_vector_ispos (const gsl_vector * v)
— Function: int gsl_vector_isneg (const gsl_vector * v)
— Function: int gsl_vector_isnonneg (const gsl_vector * v)

> These functions return 1 if all the elements of the vector v are zero, strictly positive, strictly negative, or non-negative respectively, and 0 otherwise.

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