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Explain how many times a for loop will execute

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Jorge Rodriguez
Jorge Rodriguez on 10 Oct 2020
Commented: Jorge Rodriguez on 10 Oct 2020
I can add ires to see the result, I am not sure how to see how many times the loops will execute. If someone could explain how to do this that would be helpful. I have done several searches and tried using the break function, but if its really big number says -32687:32688, how does one tell how many times it loops. without counting each 64560 times. I have figured it out on smaller loops by putting the ii at the bottom of the code. This has a loop within a loop and I am lost.
ires = 0;
for index1 = 10: -2: 1
for index2 = 2:2:index1
if index2 == 6
break;
end
ires = ires + index2;
end
end

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Answers (1)

Mario Malic
Mario Malic on 10 Oct 2020
ires = 0;
for index1 = 10: -2: 1
for index2 = 2:2:index1
if index2 == 6
break;
end
ires = ires + 1; % index2 for what?
end
end
MATLAB enters first loop with index1 = 10, then proceeds in the second loop with index2 = 2. Within second loop it checks the if condition and adds 1 to ires. When the 'if' condition is fulfilled, it exits the second loop, and returns in the first one with index1 = 8 and so on.

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Mario Malic
Mario Malic on 10 Oct 2020
Your code is working, n_times counts both loops.
Jorge Rodriguez
Jorge Rodriguez on 10 Oct 2020
Okay, I just thought it was counting loop one. Well i gave it a solid try. Thanks for your help.

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