Display result in loop while Octave is running

[in_flu_ence]

Hi,

I am running a long octave code and am trying to troubleshoot it. I have placed some disp () functions in a while loop but it becomes a blank page when I start running the code. I can only see the disp stuff after the code is finished. It works in Matlab but not in octave. Any advice?

Thanks

[artesian_spring]

I've had the same experience. It seems like octave waits until a script (or at least a loop) is finished before printing everything generated by the script/loop.

If anyone knows a way around this, I'd be interested in learning it, too.

[in_flu_ence]

Has anyone tried octave 3.0 and wonder if this is resolved?

I am currently using octave 2.9 + forge.

It is actually quite annoying that I can't troubleshoot when results start to diverge without knowing.

[yingyang116]

I am using Octave 3.0 and encountered the same problem.

[thisismalhotra]

Hi,

I am running a long octave code and am trying to troubleshoot it. I have placed some disp () functions in a while loop but it becomes a blank page when I start running the code. I can only see the disp stuff after the code is finished. It works in Matlab but not in octave. Any advice?

Thanks
I think what you need to use is a printf command and not disp
().

I use that all the time to display my loop results .. byt the way I use octave 3.0.
In case you need to upgrade you can get deb's from here

http://ubuntuforums.org/showthread.php?t=713880

Let me if it works for you/or NOT:KS

[vueltaconicarus]

Hi!

I use Octave 3.01 and had the same problem. But I found a way 'round it:

Taken from http://www.delorie.com/gnu/docs/octave/octave_100.html:
Built-in Function: fflush (fid)
Flush output to fid. This is useful for ensuring that all pending output makes it to the screen before some other event occurs.

So the code
printf('Whatever');
fflush(stdout);
will produce screen outputs even inside loops, without waiting for the loop to finish.

Best regards

[gustavx]

You can turn the paging off with:

more off;


I'm sure this will work.

[wblack]

Hi!

I use Octave 3.01 and had the same problem. But I found a way 'round it:

Taken from http://www.delorie.com/gnu/docs/octave/octave_100.html:
Built-in Function: fflush (fid)
Flush output to fid. This is useful for ensuring that all pending output makes it to the screen before some other event occurs.

So the code
printf('Whatever');
fflush(stdout);
will produce screen outputs even inside loops, without waiting for the loop to finish.

Best regards

Thanks for the tip vueltaconicarus. I used disp instead of printf and it works also. Disp automatically attaches a newline at the end so it is easier to read the output.

disp("Whatever");
fflush(stdout);

[aksehirlim]

You can turn the paging off with:

more off;
I'm sure this will work.

This worked for me. Thanks.

[tzjin anthony ks]

I have two lines in my .octaverc file (which you could add to the beginning of your code):


page_screen_output(0);
page_output_immediately(1);