## 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 returns the indices (i,j) of the bin containing the maximum value in the histogram h. 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 returns the indices (i,j) of the bin containing the minimum value in the histogram h. 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.