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<title>2D Histogram Operations - GNU Scientific Library -- Reference Manual</title>
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<h3 class="section">21.19 2D Histogram Operations</h3>
<div class="defun">
— Function: int <b>gsl_histogram2d_equal_bins_p</b> (<var>const gsl_histogram2d * h1, const gsl_histogram2d * h2</var>)<var><a name="index-gsl_005fhistogram2d_005fequal_005fbins_005fp-1946"></a></var><br>
<blockquote><p>This function returns 1 if all the individual bin ranges of the two
histograms are identical, and 0 otherwise.
</p></blockquote></div>
<div class="defun">
— Function: int <b>gsl_histogram2d_add</b> (<var>gsl_histogram2d * h1, const gsl_histogram2d * h2</var>)<var><a name="index-gsl_005fhistogram2d_005fadd-1947"></a></var><br>
<blockquote><p>This function adds the contents of the bins in histogram <var>h2</var> to the
corresponding bins of histogram <var>h1</var>,
i.e. h'_1(i,j) = h_1(i,j) + h_2(i,j).
The two histograms must have identical bin ranges.
</p></blockquote></div>
<div class="defun">
— Function: int <b>gsl_histogram2d_sub</b> (<var>gsl_histogram2d * h1, const gsl_histogram2d * h2</var>)<var><a name="index-gsl_005fhistogram2d_005fsub-1948"></a></var><br>
<blockquote><p>This function subtracts the contents of the bins in histogram <var>h2</var> from the
corresponding bins of histogram <var>h1</var>,
i.e. h'_1(i,j) = h_1(i,j) - h_2(i,j).
The two histograms must have identical bin ranges.
</p></blockquote></div>
<div class="defun">
— Function: int <b>gsl_histogram2d_mul</b> (<var>gsl_histogram2d * h1, const gsl_histogram2d * h2</var>)<var><a name="index-gsl_005fhistogram2d_005fmul-1949"></a></var><br>
<blockquote><p>This function multiplies the contents of the bins of histogram <var>h1</var>
by the contents of the corresponding bins in histogram <var>h2</var>,
i.e. h'_1(i,j) = h_1(i,j) * h_2(i,j).
The two histograms must have identical bin ranges.
</p></blockquote></div>
<div class="defun">
— Function: int <b>gsl_histogram2d_div</b> (<var>gsl_histogram2d * h1, const gsl_histogram2d * h2</var>)<var><a name="index-gsl_005fhistogram2d_005fdiv-1950"></a></var><br>
<blockquote><p>This function divides the contents of the bins of histogram <var>h1</var>
by the contents of the corresponding bins in histogram <var>h2</var>,
i.e. h'_1(i,j) = h_1(i,j) / h_2(i,j).
The two histograms must have identical bin ranges.
</p></blockquote></div>
<div class="defun">
— Function: int <b>gsl_histogram2d_scale</b> (<var>gsl_histogram2d * h, double scale</var>)<var><a name="index-gsl_005fhistogram2d_005fscale-1951"></a></var><br>
<blockquote><p>This function multiplies the contents of the bins of histogram <var>h</var>
by the constant <var>scale</var>, i.e. <!-- {$h'_1(i,j) = h_1(i,j) * \hbox{\it scale}$} -->
h'_1(i,j) = h_1(i,j) scale.
</p></blockquote></div>
<div class="defun">
— Function: int <b>gsl_histogram2d_shift</b> (<var>gsl_histogram2d * h, double offset</var>)<var><a name="index-gsl_005fhistogram2d_005fshift-1952"></a></var><br>
<blockquote><p>This function shifts the contents of the bins of histogram <var>h</var>
by the constant <var>offset</var>, i.e. <!-- {$h'_1(i,j) = h_1(i,j) + \hbox{\it offset}$} -->
h'_1(i,j) = h_1(i,j) + offset.
</p></blockquote></div>
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