Piping data into Octave

[David Bateman]

Carlo de Falco wrote:
> On 20/nov/08, at 09:19, 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?
>>     
>
> on unix systems (which includes linux and OSX) you can do this
> by using popen
>
> help popen
>
> will give all the info and a nice example.
> I don't know whether this works on windows but I am sure other people
> on the list can comment on that.
>
>   
Yes we have a windows version of both popen and popen2 as we use this 
for gnuplot even on windows..

Cheers
David



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David Bateman                                David.Bateman at motorola.com
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