> The LH0094 Multifunction Converter will do this! It computes Vout =
> Vy(Vz/Vx)^m, 0.1<m<10. Digikey has them! They only cost $92!! Let us
> know how it works if you try one. I've always been curious -- just not
> $92 curious.
Analog devices has a similar product : AD538. You can get free samples
of it at www.analog.com....
Karl.