From help-octave-request at bevo dot che dot wisc dot edu Mon Dec 22 12:18:55 2003
Subject: trivial (probably) matlab->octave question
From: Rich Drewes <drewes at interstice dot com>
To: help-octave at bevo dot che dot wisc dot edu
Date: Mon, 22 Dec 2003 10:13:31 -0800

Hello,

I am trying to get this simple Matlab function working under Octave:

function dff = anglediff(d)
                                                                                

dff=d;
i=find(d>pi);
dff(i)=2*pi-d(i);

d is a two dimensional array.  When run under Octave, I get this error:

error: single index only valid for row or column vector

The issue seems to be that find() returns indices as if the two 
dimensional array were concatenated into a vector, but the subsequent 
subtraction on the last line can't cope with this linearization of 
indices in Octave.  Matlab somehow knows how to do the right thing with 
it though.  (This raises the larger question:  how many little semantic 
differences like this are there between Octave and Matlab?)

Any suggestions on fixing this rather simple issue efficiently?

Your help is greatly appreciated.  I am a Matlab/Octave novice but long 
time open source enthusiast.  I am trying to port this application to 
Octave because the licensing server for our Matlab install is having 
problems and there is nobody around to fix it.  This makes me very annoyed.

Thanks!
Rich



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