Re: Compile

*To*: mathgroup at yoda.physics.unc.edu*Subject*: Re: Compile*From*: Jerry Keiper <keiper>*Date*: Tue, 28 Jun 1994 07:46:12 -0500

> f = Compile[ {{x, _Real}}, x/10^8 ] > > Evaluating it: > > f[1.0] -> "CompiledFunction::cfn: Numerical error > encountered at instruction 6; proceeding with uncompiled > evaluation." > I assume it's a bug, or have I missed something ? The latter, although this has been improved for the next version. Compile has the Attribute HoldAll. As such there are two operations in the expression x/10^8: integer exponentiation and floating-point division. You are getting integer overflow with 10^8. The best fix (in terma of speed) would be to use f = Compile[ {{x, _Real}}, 0.00000001 x] or f = Compile[ {{x, _Real}}, Evaluate[x/N[10^8]]] Jerry B. Keiper keiper at wri.com Wolfram Research, Inc.