unable to compile function with Part as an argument

*To*: mathgroup at smc.vnet.net*Subject*: [mg55701] unable to compile function with Part as an argument*From*: jules at julesfrancis.co.uk (Julian)*Date*: Mon, 4 Apr 2005 00:59:08 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Hi Folks, I have got a fairly complex program which I am trying to compile as it's quite numerically intensive, but I am running into problems when passing in a value that comes from an array. I've boiled it down to a toy example which illustrates what is going wrong. why the following code fails to compile? In[1]:= Developer`SetSystemOptions["CompileReportExternal" -> True] Out[1]= "CompileReportExternal" -> True In[2]:= f[x_] = Log[x] Out[2]= Log[x] In[4]:= Compile[{{v, _Real, 1}}, f[Part[v, 1]]] From In[4]:= Compile::"extscalar": "\!\(f[\(\(v \[LeftDoubleBracket] 1 \ \[RightDoubleBracket]\)\)]\) cannot be compiled and will be evaluated \ externally. The result is assumed to be of type \!\(Real\)." Out[4]= CompiledFunction[{v}, f[v\[LeftDoubleBracket]1\[RightDoubleBracket]], "-CompiledCode-"] Any help would be greatly appreciated. Thanks & regards, Julian.