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MathGroup Archive 2001

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Re: Reading arrays in mathlink

  • To: mathgroup at smc.vnet.net
  • Subject: [mg30156] Re: Reading arrays in mathlink
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 1 Aug 2001 02:19:11 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <9joa43$18o$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

from the Online-manual :

MLGetFunction() allocates memory for the character string corresponding
to the name of the head of the function. You must call MLDisownSymbol()
to disown this memory. 
          -----------------------------------------------------

General it would be better to transform the mixed type to
complex only numbers with

toSend=Flatten[
  yourArgument /. 
   {Complex[a_,b_]:> {a,b},a_Real:> {a,0.},a_Integer:> {N[a],0.}}
 ]

send a list of the double length. This should be faster
than to transfer/check every entry.

Regards
  Jens




Sseziwa Mukasa wrote:
> 
> How does one read an array in Mathlink whose entries are either real or
> complex?
> 
> I am trying the following seqeunce
> 
> int r,c,i,j,args;
> char *sym;
> double val;
> 
> MLCheckFunction( stdlink, "List", &r)
> for (i=0; i<r; i++) {
>     MLCheckFunction( stdlink, "List", &c);
>     for (j=0,j<c,j++) {
>         MLGetFunction( stdlink, &sym, &args);
>         switch (args) {
>             case 1 :
>                 MLGetReal( stdlink, &val);
>                 break;
>             case 2 :
>                 MLGetReal( stdlink, &val); /* Get real part*/
>                 MLGetReal( stdlink, &val); /* Get imaginary part*/
>                 break;
>         }
>     }
> }
> 
> The connection dies for some reason.  I have no idea why,


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