The probability functions for the Normal or Gaussian distribution are described in Abramowitz & Stegun, Section 26.2.

__Function:__double**gsl_sf_erf_Z***(double*`x`)__Function:__int**gsl_sf_erf_Z_e***(double*`x`, gsl_sf_result *`result`)- These routines compute the Gaussian probability function @math{Z(x) = (1/(2\pi)) \exp(-x^2/2)}.

__Function:__double**gsl_sf_erf_Q***(double*`x`)__Function:__int**gsl_sf_erf_Q_e***(double*`x`, gsl_sf_result *`result`)- These routines compute the upper tail of the Gaussian probability function @math{Q(x) = (1/(2\pi)) \int_x^\infty dt \exp(-t^2/2)}.

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