Anyone have an inverse erf function VI?

I scratched my head and searched the internet for a few hours. I

cannot think of a better solution that the two you posted. It looks

like you are forced into the classic tradeoff of time or space.

The problem is that the error function (erf) is a "Special Function"

which means that its derivative cannot be expressed with more

elementary functions. Thus, there is no way to find the inverse by

solving for the variable. This leaves us with numerical approximation

methods.