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

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<a name="Permutation-functions"></a>
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<p>
Next: <a href="Applying-Permutations.html#Applying-Permutations" accesskey="n" rel="next">Applying Permutations</a>, Previous: <a href="Permutation-properties.html#Permutation-properties" accesskey="p" rel="previous">Permutation properties</a>, Up: <a href="Permutations.html#Permutations" accesskey="u" rel="up">Permutations</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Permutation-functions-1"></a>
<h3 class="section">9.5 Permutation functions</h3>

<dl>
<dt><a name="index-gsl_005fpermutation_005freverse"></a>Function: <em>void</em> <strong>gsl_permutation_reverse</strong> <em>(gsl_permutation * <var>p</var>)</em></dt>
<dd><a name="index-reversing-a-permutation"></a>
<p>This function reverses the elements of the permutation <var>p</var>.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fpermutation_005finverse"></a>Function: <em>int</em> <strong>gsl_permutation_inverse</strong> <em>(gsl_permutation * <var>inv</var>, const gsl_permutation * <var>p</var>)</em></dt>
<dd><a name="index-inverting-a-permutation"></a>
<p>This function computes the inverse of the permutation <var>p</var>, storing
the result in <var>inv</var>.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fpermutation_005fnext"></a>Function: <em>int</em> <strong>gsl_permutation_next</strong> <em>(gsl_permutation * <var>p</var>)</em></dt>
<dd><a name="index-iterating-through-permutations"></a>
<p>This function advances the permutation <var>p</var> to the next permutation
in lexicographic order and returns <code>GSL_SUCCESS</code>.  If no further
permutations are available it returns <code>GSL_FAILURE</code> and leaves
<var>p</var> unmodified.  Starting with the identity permutation and
repeatedly applying this function will iterate through all possible
permutations of a given order.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fpermutation_005fprev"></a>Function: <em>int</em> <strong>gsl_permutation_prev</strong> <em>(gsl_permutation * <var>p</var>)</em></dt>
<dd><p>This function steps backwards from the permutation <var>p</var> to the
previous permutation in lexicographic order, returning
<code>GSL_SUCCESS</code>.  If no previous permutation is available it returns
<code>GSL_FAILURE</code> and leaves <var>p</var> unmodified.
</p></dd></dl>




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