Compile and Total
- To: mathgroup at smc.vnet.net
- Subject: [mg120247] Compile and Total
- From: Neil Stewart <neil.stewart at warwick.ac.uk>
- Date: Thu, 14 Jul 2011 21:20:19 -0400 (EDT)
Hello, I'm having some trouble using Compile[]. I've stripped my trouble down to a few basic examples. Compiling Total[x] works: data = Range[1, 10] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} fC = Compile[{{x, _Real, 1}}, Total[x]] CompiledFunction[{x}, Total[x], -Compiled Code-] fC[data] 55 But compiling a function g[x_]:=Total[x] does not: g[x_] := Total[x] gC = Compile[{{x, _Real, 1}}, g[x]] CompiledFunction[{x}, g[x], -Compiled Code-] gC[data] CompiledFunction::cfex: Could not complete external evaluation at instruction 1; proceeding with uncompiled evaluation. >> 55 Yet it is not something about my user function as h[x_] := x/Total[x] works: h[x_] := x/Total[x] hC = Compile[{{x, _Real, 1}}, h[x]] CompiledFunction[{x}, h[x], -Compiled Code-] hC[data] {0.0181818, 0.0363636, 0.0545455, 0.0727273, 0.0909091, 0.109091, 0.127273, 0.145455, 0.163636, 0.181818} It's not something about Total[] as I get the same results with Apply[Plus, x] instead. Any comments or insight will be extremely gratefully received. Best, Neil.
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