MATLAB: Whether ADD SEMICOLON for output will reduce execution time

add semicolon

If my code compute data for 1 day. If I ADD SEMICOLON after the statements, means nothing display in Command Windows, does this will reduce execution time greatly?

Best Answer

The only way to determine that quantitatively is to time it with and without the semicolons. Adding semicolons to suppress Command Window output would speed your code. You would have to define whether it speeds it ‘greatly’. For short routines, likely not much. For long or iterated routines, likely much.

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MATLAB: Tic toc and debug mode

Yes, the time calculated by tic and toc keeps going during debugging. tic and toc are defined as elapsed time, and time still elapses during debugging. There is no work-around for this.

If you want to know only the time spent on computation then you should be considering using cputime()

MATLAB: For statement – print on exactly 1 second

java.lang.Thread.sleep(t*1000) than is more accurate than pause(t)

tic;
for i=1:20
  toc
  disp('test');
  java.lang.Thread.sleep((i-toc)*1000);
end
["test" removed for compactness]
Elapsed time is 0.008428 seconds.
Elapsed time is 1.000497 seconds.
Elapsed time is 1.999536 seconds.
Elapsed time is 2.999586 seconds.
Elapsed time is 4.000012 seconds.
Elapsed time is 4.999816 seconds.
Elapsed time is 5.999633 seconds.
Elapsed time is 6.999679 seconds.
Elapsed time is 7.999731 seconds.
Elapsed time is 8.999758 seconds.
Elapsed time is 9.999807 seconds.
Elapsed time is 10.999854 seconds.
Elapsed time is 11.999904 seconds.
Elapsed time is 12.999952 seconds.
Elapsed time is 13.998999 seconds.
Elapsed time is 14.999047 seconds.
Elapsed time is 15.999100 seconds.
Elapsed time is 16.999148 seconds.
Elapsed time is 17.999193 seconds.
Elapsed time is 18.999260 seconds.

See http://undocumentedmatlab.com/blog/pause-for-the-better . But my measurements with pause look fairly accurate also.

Use a timer for triggering code after certain times.

Best Answer

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MATLAB: Tic toc and debug mode

MATLAB: For statement – print on exactly 1 second

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