view general/numerical/scalar/erfp.m @ 16:db7f4afd27c5

Rearranging numerical toolbox.

function y=erfp(x)
% erfp - returns Pr(X>x) for a normalised Gaussian random variable
%
% erfp :: X:real -> Z:real.
%
% Y = integeral from X to infinity of 
% (1/sqrt(2*pi)) * exp(-0.5*t.^2)

y = erfc(x/sqrt(2))/2;