ncx2cdf (Statistics Toolbox)

Noncentral chi-square cumulative distribution function (cdf).

Syntax

P = ncx2cdf(X,V,DELTA)

Description

ncx2cdf(X,V,DELTA) returns the noncentral chi-square cdf with V degrees of freedom and positive noncentrality parameter, DELTA, at the values in X.

The size of P is the common size of the input arguments. A scalar input functions as a constant matrix of the same size as the other inputs.

Some texts refer to this distribution as the generalized Rayleigh, Rayleigh-Rice, or Rice distribution.

The noncentral chi-square cdf is:

Example

x = (0:0.1:10)';
p1 = ncx2cdf(x,4,2);
p = chi2cdf(x,4);
plot(x,p,'- -',x,p1,'-')

References

Johnson, N., and S. Kotz, Distributions in Statistics: Continuous Univariate Distributions-2, John Wiley and Sons, 1970. pp. 130-148.