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<title>GNU Scientific Library &ndash; Reference Manual: Combination functions</title>

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<a name="Combination-functions"></a>
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<p>
Next: <a href="Reading-and-writing-combinations.html#Reading-and-writing-combinations" accesskey="n" rel="next">Reading and writing combinations</a>, Previous: <a href="Combination-properties.html#Combination-properties" accesskey="p" rel="previous">Combination properties</a>, Up: <a href="Combinations.html#Combinations" accesskey="u" rel="up">Combinations</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Combination-functions-1"></a>
<h3 class="section">10.5 Combination functions</h3>

<dl>
<dt><a name="index-gsl_005fcombination_005fnext"></a>Function: <em>int</em> <strong>gsl_combination_next</strong> <em>(gsl_combination * <var>c</var>)</em></dt>
<dd><a name="index-iterating-through-combinations"></a>
<p>This function advances the combination <var>c</var> to the next combination
in lexicographic order and returns <code>GSL_SUCCESS</code>.  If no further
combinations are available it returns <code>GSL_FAILURE</code> and leaves
<var>c</var> unmodified.  Starting with the first combination and
repeatedly applying this function will iterate through all possible
combinations of a given order.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fcombination_005fprev"></a>Function: <em>int</em> <strong>gsl_combination_prev</strong> <em>(gsl_combination * <var>c</var>)</em></dt>
<dd><p>This function steps backwards from the combination <var>c</var> to the
previous combination in lexicographic order, returning
<code>GSL_SUCCESS</code>.  If no previous combination is available it returns
<code>GSL_FAILURE</code> and leaves <var>c</var> unmodified.
</p></dd></dl>





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