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Function std.mathspecial.normalDistribution
Normal distribution function.
real normalDistribution
(
real x
) pure nothrow @nogc @safe;
The normal (or Gaussian, or bell-shaped) distribution is defined as:
normalDist(x) = 1/√(2π) ∫-∞x exp( - t2/2) dt = 0.5 + 0.5 * erf(x/sqrt(2)) = 0.5 * erfc(- x/sqrt(2))
To maintain accuracy at values of x near 1.0, use normalDistribution(x) = 1.0 - normalDistribution(-x).
References
http://www.netlib.org/cephes/ldoubdoc.html, G. Marsaglia, "Evaluating the Normal Distribution", Journal of Statistical Software 11, (July 2004).
Authors
Stephen L. Moshier (original C code). Conversion to D by Don Clugston
License
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.