Re: More save/load questions

[David Bateman]

SITI HAJAR A BAKAR wrote:

> Hi all,
> Just been going through all the mailing list questions on loading and 
> saving in Octave. I'm running Octave 2.1.70 via Cygwin from X11 on 
> Windows. AM afraid have confused myself, and would appreciate some 
> clarification on the following
>
> 1) If I were to create a variable u=randn(1,20). Setting 
> default_save_format='-text' or default_save_format='text'. I tried to 
> save this data to a text file for example
>
>  
If you are using a 2.1.x release then the variable and its format is

default_save_format="text"

if you are using the latest 2.9.x releases (with zlib support), then 
this variable is replaced with

default_save_options="-text"

> save u, does not work. save 'u.txt' or any other variation in between 
> did not work.
>  
save u should save the variable u under the filename name u. The other 
variants are define a filename and save all user variables to it... Both 
work under 2.9.3 under linux for me..

> Only when I created an empty .txt file named 'u' and saved it in my 
> workpath and then
>
> save (file_in_loadpath('u.txt'))   worked. If not I get
>
> error: save : couldnt open output file 'u.txt' . Any explanations for 
> this?
>  
The open mode is

std::ios::openmode mode = std::ios::out | std::ios::ate : std::ios::trunc;

and so there is no reason to require that std::ofstream constructor 
requires that the file exists... This seems to be an issue with cygwin.

> 2) Upon loading the above saved file u.txt , load (file_in_loadpath
> ('u.txt'))
> I get a bunch of errors which it wont read. Now correct me if I'm 
> wrong, but my file lacks some headers which Octave requires to read the 
> file. Is that so?
>  

Can't say you didn't send the error messages..

> 3) I achieve what i want by setting  default_save_format='-binary'
> I then create an empty file named 'u'. Then save the data I want to 
> save to 'u.txt' and the only did it read it back.
>
>  
You moved a binary file to a text file and octave recognized it as a 
binary file. Octave doesn't care about the extensions..

> 4) I'm trying to maintain a toolbox which would run on MATLAB and 
> Octave. WOuld there be any disadvantages to setting the 
> default_save_format to "binary" ??
>
>  
Why not set it to "mat-binary" in this case


> Thanks guys!
>
>
>
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--
David Bateman                                address@hidden
Motorola Labs - Paris                        +33 1 69 35 48 04 (Ph) 
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Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
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