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Re: cart2pol and external code interface

From: Markus Mützel
Subject: Re: cart2pol and external code interface
Date: Fri, 15 Oct 2021 16:16:19 +0200

You can check on Octave's interactive prompt using the function `which` whether a function is a built-in function or a .m file function.
which cart2pol
The C++ interface is "documented" by the headers.
The best way to search that is probably with Doxygen:
GNU Octave: Main Page
In particular for octave::feval:
GNU Octave: octave Namespace Reference
Gesendet: Donnerstag, 14. Oktober 2021 um 19:50 Uhr
Von: "Fritz Sonnichsen" <>
An: "Markus Mützel" <>
Betreff: Re: cart2pol and external code interface
  I had gone to this documentation and it worked for the Matrix manipulations. 
  Apparently cart2pol is something different (A built-in function?
. There is a mysterious in(0) etc used in the call. We can guess what this is but I cannot find any documentation for on the methods of the call.
On Thu, Oct 14, 2021 at 11:59 AM Markus Mützel <> wrote:
I'm assuming you would like to write a standalone program in C++ that calls Octave. Is this correct?
If this is the case, take a look at appendix A.3 Standalone Programs of the Octave manual:
It includes an example that calls the Octave function "gcd".
Calling "cart2pol" instead should work similarly.
Gesendet: Donnerstag, 14. Oktober 2021 um 17:06 Uhr
Von: "Fritz Sonnichsen" <>
Betreff: cart2pol and external code interface
I have octave running just fine on my ubuntu 16.xx machine. I also ran the octave demo program for calling octave from C++ (external code interface) and this did the Matrix algebra just fine.
  Now I need to run "cart2pol"  but I get "  but I get the errors below:
Any ideas appreciated
============ERROR MESSAGES =============================
error: ‘cart2pol’ was not declared in this scope
..../comp2: line 2: ./octpolar: No such file or directory
======== COMPLETE CODE ===============================
#include <stdio.h>
#include <stdlib.h>
#include <complex.h>
#include <iostream>
#include <iostream>

#include <octave/oct.h>
main (void)
  //float theta,rho;
  //std::cout << theta;
  //std::cout << rho;
  return 0;
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