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<title>GNU Scientific Library – Reference Manual: Searching histogram ranges</title>
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<a name="Searching-histogram-ranges"></a>
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Next: <a href="Histogram-Statistics.html#Histogram-Statistics" accesskey="n" rel="next">Histogram Statistics</a>, Previous: <a href="Updating-and-accessing-histogram-elements.html#Updating-and-accessing-histogram-elements" accesskey="p" rel="previous">Updating and accessing histogram elements</a>, Up: <a href="Histograms.html#Histograms" accesskey="u" rel="up">Histograms</a> [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Searching-histogram-ranges-1"></a>
<h3 class="section">22.5 Searching histogram ranges</h3>
<p>The following functions are used by the access and update routines to
locate the bin which corresponds to a given <em>x</em> coordinate.
</p>
<dl>
<dt><a name="index-gsl_005fhistogram_005ffind"></a>Function: <em>int</em> <strong>gsl_histogram_find</strong> <em>(const gsl_histogram * <var>h</var>, double <var>x</var>, size_t * <var>i</var>)</em></dt>
<dd><p>This function finds and sets the index <var>i</var> to the bin number which
covers the coordinate <var>x</var> in the histogram <var>h</var>. The bin is
located using a binary search. The search includes an optimization for
histograms with uniform range, and will return the correct bin
immediately in this case. If <var>x</var> is found in the range of the
histogram then the function sets the index <var>i</var> and returns
<code>GSL_SUCCESS</code>. If <var>x</var> lies outside the valid range of the
histogram then the function returns <code>GSL_EDOM</code> and the error
handler is invoked.
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