Re: Compile can't handle indexed variables inside loops

*To*: mathgroup at smc.vnet.net*Subject*: [mg114279] Re: Compile can't handle indexed variables inside loops*From*: Leonid Shifrin <lshifr at gmail.com>*Date*: Tue, 30 Nov 2010 04:01:22 -0500 (EST)

Hi Frank, This looks like a bug. I tried For loop with the same effect. I am actually surprised that Compile at all allows indexed variables. Regards, Leonid On Mon, Nov 29, 2010 at 2:08 PM, Frank K <fkampas at gmail.com> wrote: > 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] > >