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Re: On the built-in function "Compile"

  • To: mathgroup at smc.vnet.net
  • Subject: [mg90223] Re: On the built-in function "Compile"
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Wed, 2 Jul 2008 05:33:53 -0400 (EDT)
  • References: <g4d2ui$eqv$1@smc.vnet.net>

shingo wrote:
> Hi guys, I worked on the mathematica built-in function "Compile" and
> found some trobles. If u have some ideas, plz help me.
> 
> Following code works well:
> 
> In[1]:=
> testA = Compile[{{i, _Integer}}, # & /@ Range[1, i, 1]]
> 
> Out[1]:=
> CompiledFunction[{i},(#1&)/@Range[1,i,1],-CompiledCode-]
> 
> However, in the case of nested list, it doesnt.
> 
> In[2]:=
> testB = Compile[{{i, _Integer}},
>   Outer[{#1, #2} &, Range[1, i, 1], Range[1, i, 1]]]
> 
> Out[2]:=
> Compile::cpapot: Compilation of \
> Outer[{#1,#2}&,Range[1,i,1],Range[1,i,1]] is not supported for the \
> function argument {#1,#2}&. The only function arguments supported are
> \
> Times, Plus, or List. Evaluation will use the uncompiled function. >>
> CompiledFunction[{i},Outer[{#1,#2}&,Range[1,i,1],Range[1,i,1]],-
> CompiledCode-]

Well, the error message tells you what to do.  Just use

testB = Compile[{{i, _Integer}}, Outer[List, Range[i], Range[i]]]


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