From bug-request at octave dot org Tue Feb  7 13:19:07 2006
Subject: Re: empty string becomes empty array in comparison, tests fail
From: Quentin Spencer <qspencer at ieee dot org>
To: "Tom Holroyd (NIH/NIMH) [E]" <tomh at kurage dot nimh dot nih dot gov>
CC: bug at octave dot org
Date: Tue, 07 Feb 2006 13:14:29 -0600

Tom Holroyd (NIH/NIMH) [E] wrote:

> Hi.  I'm porting a largish Matlab code (40,000 lines) and found this 
> using a very recent Octave CVS 2.9.4.
>
> This is OK:
>
> octave:22> line = ' ';
> octave:23> line == 1
> ans = 0
> octave:24> line ~= 1
> ans = 1
>
> I suggest that the behavior below is wrong, and should be like the above.
>
> octave:25> line = '';
> octave:26> line ~= 1
> ans = [](0x0)
> octave:27> line == 1
> ans = [](0x0)


This is exactly what Matlab does, so as long as "compatible"=="correct", 
then this is "correct".

-Quentin



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