FNF_freturns the value of the probability density function of the univariateFprobability distribution with parametersmandnatx,f(x;m,n). This function is defined formandnpositive or zero.
f(x;1,2)
Errors
FNF_fcauses an HTBasic error if its arguments are not of the types listed in the USAGEsection, above, or if eithermornis negative.