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<h3 class="section">21.17 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 (x,y) coordinate.
<div class="defun">
— Function: int <b>gsl_histogram2d_find</b> (<var>const gsl_histogram2d * h, double x, double y, size_t * i, size_t * j</var>)<var><a name="index-gsl_005fhistogram2d_005ffind-1935"></a></var><br>
<blockquote><p>This function finds and sets the indices <var>i</var> and <var>j</var> to the 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 (x,y) is found then the function sets the
indices (<var>i</var>,<var>j</var>) and returns <code>GSL_SUCCESS</code>. If
(x,y) 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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