FNF_rayleighreturns the value of the probability density function of the Rayleigh distribution of parameterBeta(here written as ) atx,f(x;).F(x;) is defined by the expression
Fis defined for all positive values of .
f(x;β)
Errors
FNF_rayleighcauses an HTBasic error if its arguments are not all of type REAL or if the value of is negative or zero.