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<title>GNU Scientific Library – Reference Manual: Vector properties</title>
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Next: <a href="Example-programs-for-vectors.html#Example-programs-for-vectors" accesskey="n" rel="next">Example programs for vectors</a>, Previous: <a href="Finding-maximum-and-minimum-elements-of-vectors.html#Finding-maximum-and-minimum-elements-of-vectors" accesskey="p" rel="previous">Finding maximum and minimum elements of vectors</a>, Up: <a href="Vectors.html#Vectors" accesskey="u" rel="up">Vectors</a> [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Vector-properties-1"></a>
<h4 class="subsection">8.3.10 Vector properties</h4>
<p>The following functions are defined for real and complex vectors. For
complex vectors both the real and imaginary parts must satisfy the
conditions.
</p>
<dl>
<dt><a name="index-gsl_005fvector_005fisnull"></a>Function: <em>int</em> <strong>gsl_vector_isnull</strong> <em>(const gsl_vector * <var>v</var>)</em></dt>
<dt><a name="index-gsl_005fvector_005fispos"></a>Function: <em>int</em> <strong>gsl_vector_ispos</strong> <em>(const gsl_vector * <var>v</var>)</em></dt>
<dt><a name="index-gsl_005fvector_005fisneg"></a>Function: <em>int</em> <strong>gsl_vector_isneg</strong> <em>(const gsl_vector * <var>v</var>)</em></dt>
<dt><a name="index-gsl_005fvector_005fisnonneg"></a>Function: <em>int</em> <strong>gsl_vector_isnonneg</strong> <em>(const gsl_vector * <var>v</var>)</em></dt>
<dd><p>These functions return 1 if all the elements of the vector <var>v</var> are
zero, strictly positive, strictly negative, or non-negative
respectively, and 0 otherwise.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fvector_005fequal"></a>Function: <em>int</em> <strong>gsl_vector_equal</strong> <em>(const gsl_vector * <var>u</var>, const gsl_vector * <var>v</var>)</em></dt>
<dd><p>This function returns 1 if the vectors <var>u</var> and <var>v</var> are equal
(by comparison of element values) and 0 otherwise.
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