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Re: Need help with structures and "eval" function

From: John W. Eaton
Subject: Re: Need help with structures and "eval" function
Date: Tue, 21 Mar 2000 02:51:26 -0600 (CST)

On 20-Mar-2000, A Scottedward Hodel <address@hidden> wrote:

| Gerrit Visser <address@hidden> wrote:

| >Is there some way I can either execute the "eval" command from a c++
| >(.oct) environment or to ask the octave session to evaluate it and return
| >a result? I've seen something like this in the Matlab .mex method, but
| >couldn't find anything usefull in the octave help. The source files for
| >octave isn't much help either, as I do not have a month to trace all the
| >classes / functions (probably a optimistic estimate of the time!)
| I think you're looking for the feval function; look in the help-octave
| archives at

Or one of the eval functions.  In the current sources, these are
defined in parse.y.  In the 2.0.x sources, they are in

| >The second problem I have is with passing structures to C++. Is there
| >somewhere in the help files I can find out how to handle them? The
| >reason I need it is the following: For a certain optimisation problem, the
| >cost function is a generic one. The cost function needs to call a function
| >specified in one of it's argument lists, so that it can call the correct
| >function for evaluation:
| I haven't used this .oct feature in awhile, so the syntax may be out of
| date, but here's a snippet of some code I used with the Octave controls
| toolbox a few years ago:

You can also look at the sources for the octave functions that work on
structures.  The,,, and
functions should give you some idea of how you can handle structures
inside a dynamically linked function.


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