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Re: Compiling functions

  • To: mathgroup at
  • Subject: [mg31762] Re: Compiling functions
  • From: Tom Burton <tburton at>
  • Date: Sat, 1 Dec 2001 02:44:36 -0500 (EST)
  • References: <9u4g5i$lhk$>
  • Sender: owner-wri-mathgroup at


Because Compiles had Attribute HoldAll (you should in my opinion always check attributes of a function at the first hint of a problem, unless you are sure what they are), you need to Evaluate the argument expr. An easy way to prepare Compile for a complex result is to declare complex input:

tf = Compile[{{a, _Complex}, 
    {b, _Complex}, 
    {c, _Complex}}, 

On Thu, 29 Nov 2001 05:13:22 +0000 (UTC), in comp.soft-sys.math.mathematica you wrote:

>Hello. I would like to ask you for help with compiling functions.
>Let's have
>expr = (-b + Sqrt[b^2 - 4*a*c])/(2*a)
>Simple compile does not work for me:
>tf = Compile[{a, b, c}, expr];  tf[1, 2, 3]

Tom Burton

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