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<h3 class="section">21.7 Histogram Operations</h3>
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— Function: int <b>gsl_histogram_equal_bins_p</b> (<var>const gsl_histogram * h1, const gsl_histogram * h2</var>)<var><a name="index-gsl_005fhistogram_005fequal_005fbins_005fp-1783"></a></var><br>
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<blockquote><p>This function returns 1 if the all of the individual bin
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ranges of the two histograms are identical, and 0
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</p></blockquote></div>
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— Function: int <b>gsl_histogram_add</b> (<var>gsl_histogram * h1, const gsl_histogram * h2</var>)<var><a name="index-gsl_005fhistogram_005fadd-1784"></a></var><br>
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<blockquote><p>This function adds the contents of the bins in histogram <var>h2</var> to the
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corresponding bins of histogram <var>h1</var>, i.e. h'_1(i) = h_1(i) +
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h_2(i). The two histograms must have identical bin ranges.
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</p></blockquote></div>
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— Function: int <b>gsl_histogram_sub</b> (<var>gsl_histogram * h1, const gsl_histogram * h2</var>)<var><a name="index-gsl_005fhistogram_005fsub-1785"></a></var><br>
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<blockquote><p>This function subtracts the contents of the bins in histogram <var>h2</var>
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from the corresponding bins of histogram <var>h1</var>, i.e. h'_1(i) =
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h_1(i) - h_2(i). The two histograms must have identical bin ranges.
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</p></blockquote></div>
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— Function: int <b>gsl_histogram_mul</b> (<var>gsl_histogram * h1, const gsl_histogram * h2</var>)<var><a name="index-gsl_005fhistogram_005fmul-1786"></a></var><br>
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<blockquote><p>This function multiplies the contents of the bins of histogram <var>h1</var>
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by the contents of the corresponding bins in histogram <var>h2</var>,
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i.e. h'_1(i) = h_1(i) * h_2(i). The two histograms must have
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</p></blockquote></div>
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— Function: int <b>gsl_histogram_div</b> (<var>gsl_histogram * h1, const gsl_histogram * h2</var>)<var><a name="index-gsl_005fhistogram_005fdiv-1787"></a></var><br>
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<blockquote><p>This function divides the contents of the bins of histogram <var>h1</var> by
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the contents of the corresponding bins in histogram <var>h2</var>,
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i.e. h'_1(i) = h_1(i) / h_2(i). The two histograms must have
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</p></blockquote></div>
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— Function: int <b>gsl_histogram_scale</b> (<var>gsl_histogram * h, double scale</var>)<var><a name="index-gsl_005fhistogram_005fscale-1788"></a></var><br>
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<blockquote><p>This function multiplies the contents of the bins of histogram <var>h</var>
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by the constant <var>scale</var>, i.e. <!-- {$h'_1(i) = h_1(i) * \hbox{\it scale}$} -->
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h'_1(i) = h_1(i) * scale.
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</p></blockquote></div>
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— Function: int <b>gsl_histogram_shift</b> (<var>gsl_histogram * h, double offset</var>)<var><a name="index-gsl_005fhistogram_005fshift-1789"></a></var><br>
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<blockquote><p>This function shifts the contents of the bins of histogram <var>h</var> by
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the constant <var>offset</var>, i.e. <!-- {$h'_1(i) = h_1(i) + \hbox{\it offset}$} -->
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h'_1(i) = h_1(i) + offset.
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