optimize and if statement
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
I am running code that runs through a loop millions of times. I am trying to make the loop as effect as possible. The loop cannot be arrayed as future values depend on previous values. I used the profiler to see what was taking the most time in the loop. The line that is taking the the most time is an if statement:
if abs((a-b)/b) <.000001
Is there any way to speed this line up? change in the structure of the if or change in the way the condition is evaluated?
0 Kommentare
Antworten (2)
Walter Roberson
am 24 Jan. 2014
if b * 0.999999 < a & a < b * 1.000001
better recheck as it is pretty late at night for me.
David Sanchez
am 24 Jan. 2014
You can try with different combinations like:
if abs((a-b)/b)*10^6 <1
if -1<(a-b)*10^6/b && (a-b)*10^6/b <1
if -.000001<(a-b)/b && (a-b)/b <.000001
if abs((a-b)/b) <1/1000000
if -b<(a-b)*10^6 && (a-b)*10^6 <b
but the time taken to check the condition is very similar in all of them. I think you can't hardly improve much the speed of that line.
0 Kommentare
Siehe auch
Kategorien
Mehr zu Get Started with Optimization Toolbox finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!