Compile can't handle indexed variables inside loops
- To: mathgroup at smc.vnet.net
- Subject: [mg114266] Compile can't handle indexed variables inside loops
- From: Frank K <fkampas at gmail.com>
- Date: Mon, 29 Nov 2010 06:08:23 -0500 (EST)
Indexed variables are renamed. This is ok if they aren't inside a
loop
In[1]:= fc1 = Compile[{x[1],x[2]},x[1]+x[2]]
Out[1]= CompiledFunction[{x$651,x$652},x$651+x$652,-CompiledCode-]
In[2]:= fc1[1,2]
Out[2]= 3.
Indexed variables are not renamed inside a loop, so the function
fails.
In[3]:= fc2 = Compile[{x[1],x[2]},Sum[x[i],{i,2}]]
Out[3]= CompiledFunction[{x$655,x$656},\!\(
\*UnderoverscriptBox[\(\[Sum]\), \(i\), \(2\)]\(x[i]\)\),-
CompiledCode-]
In[4]:= fc2[1,2]
During evaluation of In[4]:= CompiledFunction::cfex: Could not
complete external evaluation at instruction 5;
proceeding with uncompiled evaluation. >>
Out[4]= x[1]+x[2]