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pgamma

The gamma cumulative distribution function

Calling Sequence

F = pgamma(x,a)

Parameters

x

real

a

positive real, parameter of the gamma distribution (x and a can be matrices with common size).

F

matrix.

Description

The gamma cumulative distribution function. F =Prob(X<=x) where X is a random variable with a gamma distribution of parameter a. The gamma density function with parameter a is:

x.^(a-1)exp(-x)./Gamma(a)1_{x>=0} )

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