Re: eigshow function

[Ben Abbott]

On Jun 15, 2008, at 11:34 AM, Vito De Tullio wrote:

> Hi all.
> I'm a newbie octave user. For my exam, I need to use matlab, but I  
> found
> octave (for linux).
> It works for all, but I need to use a function, eigshow, that's not  
> present
> (is present in matlab). It should draw a graphic with 2 lines  
> representing
> eigenvalues and eigenvectors...
>
> Surfing on the net, I found some implementations, but all of them  
> gave me
> errors in octave.
>
> http://web.mit.edu/18.06/www/Course-Info/Mfiles/eigshow.m
> http://kom.aau.dk/~borre/kalman/lecture3/eigshow.m
> http://www.cs.ubc.ca/~mpf/cpsc402/downloads/eigshow.m
>
> for example the first give me
>
> octave:1> eigshow
> warning: get: invalid property `tag'
> error: `x' undefined near line 29 column 30
> error: evaluating argument list element number 2
> error: evaluating assignment expression near line 29, column 12
> error: evaluating if command near line 28, column 3
> error: called from `isequal' in file
> `/usr/share/octave/2.9.12/m/general/isequal.m'
> error: if: error evaluating conditional expression
> error: evaluating if command near line 51, column 1
> error: called from `eigshow:initialize' in file `/home/zed/eigshow.m'
> error: evaluating if command near line 33, column 1
> error: called from `eigshow' in file `/home/zed/eigshow.m'
> octave:1>
>
> can you help me?

I  have not tried to use eigshow.m, but the invalid property warning  
for 'tag' is no longer a problem in the most recent release, 3.0.1.

How did you install Octave? ... I'd be surprised if a more recent  
version of Octave is not available for you.

        http://www.gnu.org/software/octave/download.html

Ben