Re: How to get Octave.app to work?

[Matthias Brennwald]

On 03.09.2007, at 21:39, Vic Norton wrote:

> On Sep 3, 2007, at 1:34 PM, Matthias Brennwald wrote:
>
> > > Test 1. From terminal I execute
> > >     vic$ /Applications/Octave.app/Contents/Resources/bin/octave
> > > This gets me into octave-2.9.13. Now I execute
> > >     octave-2.9.13> printf("%d\n", fopen ("~/desktop/
> > > octave_output.txt", "wt"));
> > > The output is
> > >     3
> >
> > You've just opened the file with write access...
>
> That's what I want to do, write to it.
>
> > > Test 2. From terminal I execute
> > >     vic$ /usr/local/bin/octave
> > > This gets me into octave-2.9.9. Now I execute
> > >     octave> printf("%d\n", fopen ("~/desktop/octave_output.txt",
> > > "wt"));
> > > The output is
> > >     -1
> >
> > ...and you're trying to open the same file with write access again. I
> > guess that might explain why this second call to fopen is not
> > successful. Not sure, though.
>
> This is a different shell and a different version of octave, Matthias.

I know. But its the same file, and this file is in use with write  
access by the first Octave (2.9.13). I guess its not a good idea to  
open the same file twice with write access (but not sure). What would  
happen if both Octaves would write to the file?

> The -1 output tells me that I can't write to the octave_output.txt  
> file on my desktop because this octave (2.9.9) can't see it.

What do you mean by "can't see it"? The -1 simply means there has  
been an error with opening the file.

What happens if you try to open the file with read access only?

Also, from reading 'help fopen', you will see that you can get an  
error message back from fopen. Try...

[fid,msg] = fopen("~/desktop/octave_output.txt","wt")

...and check msg for a description of the error that occurs with  
opening your file in Octave 2.9.9.

Matthias


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Matthias Brennwald
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