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## 21.18 2D Histogram Statistics

__Function:__double**gsl_histogram2d_max_val***(const gsl_histogram2d **`h`)This function returns the maximum value contained in the histogram bins.

__Function:__void**gsl_histogram2d_max_bin***(const gsl_histogram2d **`h`, size_t *`i`, size_t *`j`)This function finds the indices of the bin containing the maximum value in the histogram

`h`and stores the result in (`i`,`j`). In the case where several bins contain the same maximum value the first bin found is returned.

__Function:__double**gsl_histogram2d_min_val***(const gsl_histogram2d **`h`)This function returns the minimum value contained in the histogram bins.

__Function:__void**gsl_histogram2d_min_bin***(const gsl_histogram2d **`h`, size_t *`i`, size_t *`j`)This function finds the indices of the bin containing the minimum value in the histogram

`h`and stores the result in (`i`,`j`). In the case where several bins contain the same maximum value the first bin found is returned.

__Function:__double**gsl_histogram2d_xmean***(const gsl_histogram2d **`h`)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.

__Function:__double**gsl_histogram2d_ymean***(const gsl_histogram2d **`h`)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.

__Function:__double**gsl_histogram2d_xsigma***(const gsl_histogram2d **`h`)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.

__Function:__double**gsl_histogram2d_ysigma***(const gsl_histogram2d **`h`)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.

__Function:__double**gsl_histogram2d_cov***(const gsl_histogram2d **`h`)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.

__Function:__double**gsl_histogram2d_sum***(const gsl_histogram2d **`h`)This function returns the sum of all bin values. Negative bin values are included in the sum.

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