Re: Piping data into Octave

[David Bateman]

Matthias Brennwald wrote:
> Dear all
>
> Here's my situation: I need to communicate between Octave and a shell  
> command. The shell command takes input data from a text file,  
> processes this data, and sends the result to stdout. I use Octave's  
> system(...) command to do this. I send the output to a text file  
> using a pipe. Then, the result data is loaded into Octave by reading  
> the contents from disk.
>
> The proplem: If the data becomes too large, the above procedure  
> becomes slow. I guess this could be sped up by omitting the data  
> transfer through the output file on disk. Can this be done by piping  
> the data from the external program directly back into Octave? If so:  
> how? Will this work on Linux, Windows, and Mac OS X?
>
>   

Yes it can be, as this is what we currently do with the gnuplot 
interface.. Check the popen and popen2 commands.

Regards
David


--
David Bateman                                address@hidden
Motorola Labs - Paris                        +33 1 69 35 48 04 (Ph) 
Parc Les Algorithmes, Commune de St Aubin    +33 6 72 01 06 33 (Mob) 
91193 Gif-Sur-Yvette FRANCE                  +33 1 69 35 77 01 (Fax) 

The information contained in this communication has been classified as: 

[x] General Business Information 
[ ] Motorola Internal Use Only 
[ ] Motorola Confidential Proprietary