Re: saving structure error in octave 3.2.3, ubuntu 10.04

[Tatsuro MATSUOKA]

Hello

--- On Fri, 2012/1/6, Steve Thompson wrote:

> Hello,
> 
> For our development, we are running Ubuntu LTS 10.04 (because we need 
> something stable).  In that distro, Octave 3.2.3 is supplied.
> 
> I have a strange error, and it can be boiled down to this:
> 
> +++ snip ++++++++++++++++
> 
> % this gives me a bad file:
> clear y
> for i = 1 : 36
> y(i).hi = [-0.707106781186547 - 0.707106781186547i, ...
>             0.707106781186547 - 0.707106781186547i, ...
>            -0.707106781186547 + 0.707106781186547i, ...
>             0.707106781186547 + 0.707106781186547i].';
> end
> save ohmy.mat y
> clear y
> load ohmy.mat
> 
> % this gives me a good file:
> clear y
> for i = 1 : 36
> y(i).hi = [1 + j, 1 - j; 1 - j, 1 + j];
> y(i).hi = [-0.70711 - 0.70711i, ...
>             0.70711 - 0.70711i, ...
>            -0.70711 + 0.70711i, ...
>             0.70711 + 0.70711i].';
> end
> save ohmy.mat y
> clear y
> load ohmy.mat
> 
> +++ snip ++++++++++++++++
> 
> In the first case, after the load ohmy.mat,  the y structure is now where to 
> be seen.  Opening ohmy.mat in a text editor, it appears corrupted.
> 
> In the second case, everything is fine.  Opening ohmy.mat reads nicely.
> 
> This appears to be some type of bug in Octave 3.2.3 and Octave 3.0.5 as 
> supplied by Ubuntu 10.04.
> 
> When I do the same thing in Octave 3.4.2 as supplied by cygwin and Octave 
> 3.4.3 as supplied by the MS Windows install, I do not get this bad behavior: 
> everything works as it should in these cases.
> 
> I need to stay in my Ubuntu 10.04 environment.  Is there a fixed to Octave 
> 3.2.3 to make this problem go away?  Or, do I have to install a newer version 
> of Octave in Ubuntu 10.04?  Is there an easy way to install, for example, 
> Octave 3.2.4 in Ubuntu 10.04?  (I've poked around the web, and it looks like 
> this has to be done by compiling from source?  I'd like to avoid this step if 
> possible!)

To my knowledge, you should build octave from source to use version 3.4 on 
Ubuntu.
Please see the guide

http://www.octave.org/wiki/index.php?title=Octave_for_GNU_Linux:_Binary_Octave_packages_for_GNU_Linux#Ubuntu

I am a newbie to the Ubuntu. However, the build from octave 3.4 from source is 
far easy that on windows.

Regards

Tatsuro