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<h3 class="section">22.18 2D Histogram Statistics</h3>
<div class="defun">
— Function: double <b>gsl_histogram2d_max_val</b> (<var>const gsl_histogram2d * h</var>)<var><a name="index-gsl_005fhistogram2d_005fmax_005fval-2044"></a></var><br>
<blockquote><p>This function returns the maximum value contained in the histogram bins.
</p></blockquote></div>
<div class="defun">
— Function: void <b>gsl_histogram2d_max_bin</b> (<var>const gsl_histogram2d * h, size_t * i, size_t * j</var>)<var><a name="index-gsl_005fhistogram2d_005fmax_005fbin-2045"></a></var><br>
<blockquote><p>This function finds the indices of the bin containing the maximum value
in the histogram <var>h</var> and stores the result in (<var>i</var>,<var>j</var>). In
the case where several bins contain the same maximum value the first bin
found is returned.
</p></blockquote></div>
<div class="defun">
— Function: double <b>gsl_histogram2d_min_val</b> (<var>const gsl_histogram2d * h</var>)<var><a name="index-gsl_005fhistogram2d_005fmin_005fval-2046"></a></var><br>
<blockquote><p>This function returns the minimum value contained in the histogram bins.
</p></blockquote></div>
<div class="defun">
— Function: void <b>gsl_histogram2d_min_bin</b> (<var>const gsl_histogram2d * h, size_t * i, size_t * j</var>)<var><a name="index-gsl_005fhistogram2d_005fmin_005fbin-2047"></a></var><br>
<blockquote><p>This function finds the indices of the bin containing the minimum value
in the histogram <var>h</var> and stores the result in (<var>i</var>,<var>j</var>). In
the case where several bins contain the same maximum value the first bin
found is returned.
</p></blockquote></div>
<div class="defun">
— Function: double <b>gsl_histogram2d_xmean</b> (<var>const gsl_histogram2d * h</var>)<var><a name="index-gsl_005fhistogram2d_005fxmean-2048"></a></var><br>
<blockquote><p>This function returns the mean of the histogrammed x variable, where the
histogram is regarded as a probability distribution. Negative bin values
are ignored for the purposes of this calculation.
</p></blockquote></div>
<div class="defun">
— Function: double <b>gsl_histogram2d_ymean</b> (<var>const gsl_histogram2d * h</var>)<var><a name="index-gsl_005fhistogram2d_005fymean-2049"></a></var><br>
<blockquote><p>This function returns the mean of the histogrammed y variable, where the
histogram is regarded as a probability distribution. Negative bin values
are ignored for the purposes of this calculation.
</p></blockquote></div>
<div class="defun">
— Function: double <b>gsl_histogram2d_xsigma</b> (<var>const gsl_histogram2d * h</var>)<var><a name="index-gsl_005fhistogram2d_005fxsigma-2050"></a></var><br>
<blockquote><p>This function returns the standard deviation of the histogrammed
x variable, where the histogram is regarded as a probability
distribution. Negative bin values are ignored for the purposes of this
calculation.
</p></blockquote></div>
<div class="defun">
— Function: double <b>gsl_histogram2d_ysigma</b> (<var>const gsl_histogram2d * h</var>)<var><a name="index-gsl_005fhistogram2d_005fysigma-2051"></a></var><br>
<blockquote><p>This function returns the standard deviation of the histogrammed
y variable, where the histogram is regarded as a probability
distribution. Negative bin values are ignored for the purposes of this
calculation.
</p></blockquote></div>
<div class="defun">
— Function: double <b>gsl_histogram2d_cov</b> (<var>const gsl_histogram2d * h</var>)<var><a name="index-gsl_005fhistogram2d_005fcov-2052"></a></var><br>
<blockquote><p>This function returns the covariance of the histogrammed x and y
variables, where the histogram is regarded as a probability
distribution. Negative bin values are ignored for the purposes of this
calculation.
</p></blockquote></div>
<div class="defun">
— Function: double <b>gsl_histogram2d_sum</b> (<var>const gsl_histogram2d * h</var>)<var><a name="index-gsl_005fhistogram2d_005fsum-2053"></a></var><br>
<blockquote><p>This function returns the sum of all bin values. Negative bin values
are included in the sum.
</p></blockquote></div>
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