GNU Scientific Library Reference Manual - Third Edition (v1.12)by M. Galassi, J. Davies, J. Theiler, B. Gough, G. Jungman, P. Alken, M. Booth, F. Rossi Paperback (6"x9"), 592 pages, 60 figures ISBN 0954612078 RRP £24.95 ($39.95) |

## 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.

ISBN 0954612078 | GNU Scientific Library Reference Manual - Third Edition (v1.12) | See the print edition |