FNF_laplacereturns the value of the probability density function of the Laplace distribution of parametersaandbatx,f(x;a,b).F(x;a,b) is defined by the expression
Fis defined for all positive values ofb.
Errors
FNF_laplacecauses an HTBasic error if its arguments are not all of type REAL or if the value ofbis negative or zero.