ncx2cdf
Noncentral Chi-Square cumulative distribution function (CDF).
p = ncx2cdf (x, df, delta) returns the
noncentral chi-square cdf with df degrees of freedom and noncentrality
parameter delta at the values of x.
The size of p is the common size of the input arguments. Scalar input arguments x, df, delta are regarded as constant matrices of the same size as the other inputs.
p = ncx2cdf (x, df, delta, "upper" returns the
upper tail probability of the noncentral chi-square distribution with
df degrees of freedom and noncentrality parameter delta at the
values in x.
See also: ncx2inv, ncx2pdf, ncx2rnd, ncx2stat
Source Code: ncx2cdf
## Compare the noncentral chi-square cdf with DELTA = 2 to the
## chi-square cdf with the same number of degrees of freedom (4):
x = (0:0.1:10)';
ncx2 = ncx2cdf (x, 4, 2);
chi2 = chi2cdf (x, 4);
plot(x, ncx2, "b-", "LineWidth", 2);
hold on
plot (x, chi2, "g--", "LineWidth", 2);
legend ("ncx2", "chi2", "Location", "NorthWest");
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