__Function:__int**gsl_histogram2d_equal_bins_p***(const gsl_histogram2d **`h1`, const gsl_histogram2d *`h2`)- This function returns 1 if the all of the individual bin ranges of the two histograms are identical, and 0 otherwise.

__Function:__int**gsl_histogram2d_add***(gsl_histogram2d **`h1`, const gsl_histogram2d *`h2`)-
This function adds the contents of the bins in histogram
`h2`to the corresponding bins of histogram`h1`, i.e. @math{h'_1(i,j) = h_1(i,j) + h_2(i,j)}. The two histograms must have identical bin ranges.

__Function:__int**gsl_histogram2d_sub***(gsl_histogram2d **`h1`, const gsl_histogram2d *`h2`)-
This function subtracts the contents of the bins in histogram
`h2`from the corresponding bins of histogram`h1`, i.e. @math{h'_1(i,j) = h_1(i,j) - h_2(i,j)}. The two histograms must have identical bin ranges.

__Function:__int**gsl_histogram2d_mul***(gsl_histogram2d **`h1`, const gsl_histogram2d *`h2`)-
This function multiplies the contents of the bins of histogram
`h1`by the contents of the corresponding bins in histogram`h2`, i.e. @math{h'_1(i,j) = h_1(i,j) * h_2(i,j)}. The two histograms must have identical bin ranges.

__Function:__int**gsl_histogram2d_div***(gsl_histogram2d **`h1`, const gsl_histogram2d *`h2`)-
This function divides the contents of the bins of histogram
`h1`by the contents of the corresponding bins in histogram`h2`, i.e. @math{h'_1(i,j) = h_1(i,j) / h_2(i,j)}. The two histograms must have identical bin ranges.

__Function:__int**gsl_histogram2d_scale***(gsl_histogram2d **`h`, double`scale`)-
This function multiplies the contents of the bins of histogram
`h`by the constant`scale`, i.e. @c{$h'_1(i,j) = h_1(i,j) * \hbox{\it scale}$} @math{h'_1(i,j) = h_1(i,j) scale}.

__Function:__int**gsl_histogram2d_shift***(gsl_histogram2d **`h`, double`offset`)-
This function shifts the contents of the bins of histogram
`h`by the constant`offset`, i.e. @c{$h'_1(i,j) = h_1(i,j) + \hbox{\it offset}$} @math{h'_1(i,j) = h_1(i,j) + offset}.

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