MATLAB: Which one is faster for loop or switch

for loopswitch case

Hi, I want to know which looping is better from programming point of view i.e. for loop or switch.

In my coding I have used switch and case , and it is taking lots of time. I am using it for optimization.

Kindly help me out in order to improve the speed of my code.

Any suggestion is appreciated.

Thanks, Suraj

Best Answer

http://blogs.mathworks.com/pick/2008/01/02/matlab-basics-switch-case-vs-if-elseif/

read in the comments. (I guess you are talking about if statements and not loops)

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MATLAB: Breaking out from loop

Hi, you can use the "tic" and "toc" matlab functions, which ones let you to create a timer and control the elapsed time between the execution of a code, for example in your case:

tStart=tic;%starts the timer
for n=1:10e50
a=n+1;%here your function
tEnd=toc(tStart);
if(tEnd>=(2*60))%checks if it has passed 2minutes
  disp('It has spent 2min');
  break;%break the for loop if it's true the condition
end
end

tEnd has got the time elapsed in seconds, and 10e50 is a value I have set randomly to make the code spend more than two minutes. In the condition you can see I have set "2" minutes in seconds.

Regards!

MATLAB: Which way of programming is more efficient and faster

No, there is no difference between the cases. More importantly, even if there was, you shouldn't care until you've proven that the operations are a bottleneck.

If you haven't proven that the operations are a bottle neck (by using the profiler), then you should care about clarity, and for that reason, you should prefer case 1 over case 2. As for the other two cases, unless nVar and v1 are going to be reused later on, I'd prefer case 4 as there's little point in creating temporary variables that are only used once.

But again, considerations about speed shouldn't even be on your radar at this point.

Best Answer

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MATLAB: Breaking out from loop

MATLAB: Which way of programming is more efficient and faster

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