How can I flush the output of disp in Matlab or Octave?

Question

I have a program in Octave that has a loop - running a function with various parameters, not something that I can turn into matrices. At the beginning of each iteration I print the current parameters using disp.

The first times I ran it I had a brazillion warnings, and then I also got these prints. Now that I cleaned them up, I no longer see them. My guess is that they're stuck in a buffer, and I'll see them when the program ends or the buffer fills.

Is there any way to force a flush of the print buffer so that I can see my prints?

Answer 1

If I understand your question correctly, you can use diary function to dump all session output to a text file. diary on will start recording, and diary off will stop. diary filename will use filename instead of default "diary".

It is build -in function in both Octave and MATLAB. For more details see help diary.

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Also you can increase Octave buffer size. On Windows you can do it in Octave Properties dialog from upper left corner menu.

Answer 2

drawnow will cause graphs to update, I'm not sure if it works on the stdout pipe as well.

You might also convert your disp(...) statements to fprintf(stderr, ...), I think stderr is handled differently from stdout on Octave.

Answer 3

Use fflush(stdout) and/or fflush(stderr) to flush the buffer from disp().