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a mathlink question

• To: mathgroup at smc.vnet.net
• Subject: [mg89620] a mathlink question
• From: GS <vokaputs at gmail.com>
• Date: Sun, 15 Jun 2008 06:13:19 -0400 (EDT)

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.

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.

• Follow-Ups:
  • Re: a mathlink question
    • From: "Szabolcs HorvÃt" <szhorvat@gmail.com>
  • Re: a mathlink question
    • From: "J. McKenzie Alexander" <jalex@lse.ac.uk>