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Re: a mathlink question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg89654] Re: [mg89620] a mathlink question
  • From: "Szabolcs HorvÃt" <szhorvat at gmail.com>
  • Date: Mon, 16 Jun 2008 06:41:42 -0400 (EDT)
  • References: <200806151013.GAA12268@smc.vnet.net>

On Sun, Jun 15, 2008 at 13:13, GS <vokaputs at gmail.com> wrote:
> I would like to call a C-program from Mathematica. All the examples in
> the MathLink tutorials (like AddTwo[i,j]) work like this: they are
> called from Mathematica, are executed, send the result to Mathematica
> and exit.

This is not correct.  The program does *not* exit unless you
explicitly terminate it with Uninstall[].  This means that you can use
a global or static variable normally to persist data between
subsequent calls.

>
> I would like a C-program to not exit after the execution, and keep the
> memory of the previous inputs. Say, I want an external C-program, to
> be called as AddToPreviousSum[x]. When it is first called, it returns
> x. When it is called the second time AddToPreviousSum[y], it returns x
> +y. When it is called the third time AddToPreviousSum[z], it returns x
> +y+z, and so on.
>
> How do I implement this in C using MathLink?
>
> Thanks.
> GS.
>
>


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