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<title>GNU Scientific Library – Reference Manual: Searching 2D histogram ranges</title>
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Next: <a href="2D-Histogram-Statistics.html#g_t2D-Histogram-Statistics" accesskey="n" rel="next">2D Histogram Statistics</a>, Previous: <a href="Updating-and-accessing-2D-histogram-elements.html#Updating-and-accessing-2D-histogram-elements" accesskey="p" rel="previous">Updating and accessing 2D 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-2D-histogram-ranges-1"></a>
<h3 class="section">22.17 Searching 2D 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,y)</em> coordinate.
</p>
<dl>
<dt><a name="index-gsl_005fhistogram2d_005ffind"></a>Function: <em>int</em> <strong>gsl_histogram2d_find</strong> <em>(const gsl_histogram2d * <var>h</var>, double <var>x</var>, double <var>y</var>, size_t * <var>i</var>, size_t * <var>j</var>)</em></dt>
<dd><p>This function finds and sets the indices <var>i</var> and <var>j</var> to
the bin which covers the coordinates (<var>x</var>,<var>y</var>). The bin is
located using a binary search. The search includes an optimization for
histograms with uniform ranges, and will return the correct bin immediately
in this case. If <em>(x,y)</em> is found then the function sets the
indices (<var>i</var>,<var>j</var>) and returns <code>GSL_SUCCESS</code>. If
<em>(x,y)</em> lies outside the valid range of the histogram then the
function returns <code>GSL_EDOM</code> and the error handler is invoked.
</p></dd></dl>
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