Grocer Function
NAME
chis_pdf - chi-squared probability distribution
CALLING SEQUENCE
[f]=chis_pdf(x,a)
PARAMETERS
Input
-
x = a (nxm) matrix
-
a = a scalar or a (nxm) matrix
Output
-
f = a matrix of pdf at each element of x from chisq(a) or chisq(same element of a) distribution
DESCRIPTION
Returns the pdf at x of the chi-squared(n) distribution. NOTE: chis_pdf(x,n) = gamm_pdf(x/2,n/2)/2
EXAMPLES
1) y=chis_pdf([1:4],2)
2) y=chis_pdf([1:4],2*ones(1,4))
Examples 1 and 2 do exactly the same thing: they provide the (1x4) vectors of probabilities that a chi-square is greater than 1, 2, 3 and 4 respectively.
AUTHOR
Eric Dubois 2002