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Re: feval call to a subfunction fails when it is in a subfunction

From: Ben Abbott
Subject: Re: feval call to a subfunction fails when it is in a subfunction
Date: Wed, 30 Sep 2009 21:53:45 -0400

On Sep 30, 2009, at 9:40 PM, Sidney Markowitz wrote:

I'm new to using Octave and don't know if this is a bug in my code, a
bug in Octave, or something wrong with my installed copy of Octave.

The following code demonstrates the problem. The first feval, in the
main function, works and the result is displayed. The other feval,
inside the subfunction switchyard2, gets an error in line 9
 error: feval: function `mysin' not found

I am using Octave version 3.2.2 compiled on my Macbook under MacOS
10.6.1, downloaded and built from Macports. I put the following text in a file named ./switchyard.m and invoked it in the Octave command line by
typing   switchyard(10)

Do others get the same results? Is there a bug in my example code? Is it
a bug in Octave?

function y = switchyard(x)
   z = feval('mysin', x);
   y = switchyard2(x);

function y = switchyard2(x)
  y = feval('mysin', x);

function y= mysin(x)
  y = sin(x);

It appears that I'm getting the same.

octave-3.2.2:4> switchyard(pi)
error: feval: function `mysin' not found
error: called from:
error:   /Users/bpabbott/switchyard.m at line 9, column 5
error:   /Users/bpabbott/switchyard.m at line 4, column 6

01 function y = switchyard(x)
02    z = feval('mysin', x);
03    disp(z);
04    y = switchyard2(x);
05   return;
06 endfunction
08 function y = switchyard2(x)
09   y = feval('mysin', x);
10   return;
11 endfunction
13 function y= mysin(x)
14   y = sin(x);
15  return;
16 endfunction

I'm also running Mac OS 10.6.

I'm presently building the developers sources, so I can't check them till tomorrow.


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