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Re: Passing functions to C-code

• To: mathgroup at smc.vnet.net
• Subject: [mg31590] Re: Passing functions to C-code
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Thu, 15 Nov 2001 05:52:24 -0500 (EST)
• Organization: Universitaet Leipzig
• References: <9stbsl$3dd$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

*what* do you like to pass the  C-Code
a) the name of the function ?
   Yes, you can do this and your C-code will get a
   Symbol tha can be used by MLPutFunction()
b) the *definition*, this is a bit complicated on both
   sides because Definition[MyFunc] is just a wrapper that
   returns the printed form of the definition and you have to
   pass ToString[Definition[MyFunc]] as a string and you C-Code
   must be able to parse the Mathematica syntax
c) the UpValues[], DownValues[] of MyFunc, that are 
   Mathematica rules, and you program has to
   read it with :ArgumentType: Manual  and
   has to deal with HoldPattern[]s to interpret it.

Regards
  Jens

"Lawrence A. Walker Jr." wrote:
> 
> Hi,
> 
> I am wondering if it is possible to pass functions to C-code using
> Mathlink.  I know that I can pass numbers, arrays, and matrices to my
> C-code function.
> 
> For example if I specify a function called
> 
> MyFunc[x_,y_]:=x+y;
> 
> Then I would like to pass this function to my linked C-code like so,
> 
> myCfunc[MyFunc]
> 
> If this is possible then I can pass error functions to my externally
> link C-code for optimization.
> 
> Thanks,
> Lawrence