Re: Loading a matrix from ASCII file (avoiding scripting?)

[Federico Zenith]

Alle 15:58, giovedì 26 agosto 2004, Mauro Casadei ha scritto:
> Hi all !
>
> I am a newcomer to Octave and to this list, so this is my chance to say hi
> to everybody ! :-)

Welcome!

> My problem is that I would like to be able to load into arrays and/or
> matrixes some plain, tab-delimited real/integers data.
>
> The file format would be something like the following:
>
> 0.0 1.0 3.0
> 1.0  2.5 5.1

I did something similar with a CSV file, I used gawk; there's a Windows 
version of gawk here:
http://gnuwin32.sourceforge.net/packages/gawk.htm

For files created under Windows and moved to Linux, one should never forget 
the following (broke my head on this for a day):

$ sed -i -e "s/\r\n/\n/g" yourFile.txt  
(This to remove the Windows-style carriage returns, if you created the file in 
Windows and want to use it in Linux|Unix)

The command in Linux (is probably the same or almost in Windows) is:

$ gawk '{print $1", "$2", "$3";"}' yourFile.txt > dataFile

Then, you should add the starting "mymatrix = [" and ending "] ;" to dataFile 
manually (it should not be tragic). Then, the dataFile can be loaded in 
Octave, and you can manipulate it from there.

Yes, it's scripting, but it seems quite simple to me to be worth trying.

Maybe someone knows a way of calling OS commands from the Octave shell, so it 
can be implemented in a Octave function?

Cheers,
-Federico

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