From help-request at octave dot org Tue Jan 18 06:05:43 2005
Subject: Re: Dynamic extensions: from octave_value to *double and vice versa
From: Muthu <dearestchum at yahoo dot co dot in>
To: Nicolo Giorgetti <giorgetti at dii dot unisi dot it>, help@octave.org
Date: Tue, 18 Jan 2005 04:08:14 -0800 (PST)

HI Nicolo!
What you say is very easily possible.
Please read the docs at http://wiki.octave.org
and the CoDa documents. Checkout the 'info octave'
and its section on dynamic extensions.

For your case just do this:
DEFUN_DLD(matrix_xyz,args,,"no comments")
{ 
   Octave_Matrix x;
   x=args(0).matrix_value();
 
   //make changes.
   x(1,1)=200-x.getElem(1,1);

   return octave_value(x);
}

Please lookinto the header file ov.h and use the 
member functions like 

         octave_value v;
         v.string_value()
         v.integer_value();
         v.ulong_value();
         v.scalar_value()
         etc.

Actually you will know that octave_value is a
polymorphic base type that supports all the various
operations in it.

Cheers
Muthu.

         





		
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