`Deriv_(st[[2]], x, env, use.D)` in result of Deriv about deriv

[notEvil]

Of course, I found what the Deriv_... should be. pnorm is not in the drule environment. Why this doesn't stop Deriv from returning something I can't tell. Usually it complains as soon as there is some rule missing.

for now I use the following rule which seems valid (checked with numDeriv). You should consider adding this to the builtins

assign('pnorm', alist(q=dnorm(q, mean, sd), mean=-dnorm(q, mean, sd), sd=dnorm(q, mean, sd)*(mean - q)/sd), envir=Deriv::drule)

btw, great work

[sgsokol]

It was Simplify() who catched unduly an error message about unknown function.
It is fixed in the version 3.5
Thx