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<a name="Histogram-Operations"></a>
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<p>
Next: <a href="Reading-and-writing-histograms.html#Reading-and-writing-histograms" accesskey="n" rel="next">Reading and writing histograms</a>, Previous: <a href="Histogram-Statistics.html#Histogram-Statistics" accesskey="p" rel="previous">Histogram Statistics</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="Histogram-Operations-1"></a>
<h3 class="section">22.7 Histogram Operations</h3>
<dl>
<dt><a name="index-gsl_005fhistogram_005fequal_005fbins_005fp"></a>Function: <em>int</em> <strong>gsl_histogram_equal_bins_p</strong> <em>(const gsl_histogram * <var>h1</var>, const gsl_histogram * <var>h2</var>)</em></dt>
<dd><p>This function returns 1 if the all of the individual bin
ranges of the two histograms are identical, and 0
otherwise.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fhistogram_005fadd"></a>Function: <em>int</em> <strong>gsl_histogram_add</strong> <em>(gsl_histogram * <var>h1</var>, const gsl_histogram * <var>h2</var>)</em></dt>
<dd><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. <em>h'_1(i) = h_1(i) +
h_2(i)</em>. The two histograms must have identical bin ranges.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fhistogram_005fsub"></a>Function: <em>int</em> <strong>gsl_histogram_sub</strong> <em>(gsl_histogram * <var>h1</var>, const gsl_histogram * <var>h2</var>)</em></dt>
<dd><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. <em>h'_1(i) =
h_1(i) - h_2(i)</em>. The two histograms must have identical bin ranges.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fhistogram_005fmul"></a>Function: <em>int</em> <strong>gsl_histogram_mul</strong> <em>(gsl_histogram * <var>h1</var>, const gsl_histogram * <var>h2</var>)</em></dt>
<dd><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. <em>h'_1(i) = h_1(i) * h_2(i)</em>. The two histograms must have
identical bin ranges.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fhistogram_005fdiv"></a>Function: <em>int</em> <strong>gsl_histogram_div</strong> <em>(gsl_histogram * <var>h1</var>, const gsl_histogram * <var>h2</var>)</em></dt>
<dd><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. <em>h'_1(i) = h_1(i) / h_2(i)</em>. The two histograms must have
identical bin ranges.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fhistogram_005fscale"></a>Function: <em>int</em> <strong>gsl_histogram_scale</strong> <em>(gsl_histogram * <var>h</var>, double <var>scale</var>)</em></dt>
<dd><p>This function multiplies the contents of the bins of histogram <var>h</var>
by the constant <var>scale</var>, i.e. <em>h'_1(i) = h_1(i) * scale</em>.
</p></dd></dl>
<dl>
<dt><a name="index-gsl_005fhistogram_005fshift"></a>Function: <em>int</em> <strong>gsl_histogram_shift</strong> <em>(gsl_histogram * <var>h</var>, double <var>offset</var>)</em></dt>
<dd><p>This function shifts the contents of the bins of histogram <var>h</var> by
the constant <var>offset</var>, i.e. <em>h'_1(i) = h_1(i) + offset</em>.
</p></dd></dl>
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