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<h3 class="section">21.5 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 x coordinate.
<div class="defun">
— Function: int <b>gsl_histogram_find</b> (<var>const gsl_histogram * h, double x, size_t * i</var>)<var><a name="index-gsl_005fhistogram_005ffind-1876"></a></var><br>
<blockquote><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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