Have for loop script do something only every Nth iteration

Question

In MATLAB (or more generally) if I wanted something to happen only, for example, every 50 iterations of a for loop how could I do this better than below? That is to not write out every possible value of +50. Thanks.

for i = 1:1060;
    if i = 50 || 100 || 150 || ... || 1050
        randi(i); % for example, just do something
    end;
end;

I don't know the MATLAB syntax, but you are looking for the modulus (remainder after division) function: E.g. if i mod 50 = 0 .. — Blorgbeard
– Blorgbeard, Commented Dec 6, 2012 at 4:24

Colin T Bowers · Accepted Answer · 2012-12-06 04:29:14Z

6

What you want is

if mod(i, 50) == 0
  do something

edited Dec 6, 2012 at 4:29

Colin T Bowers

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answered Dec 6, 2012 at 4:26

Diego Basch

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1 Comment

Colin T Bowers Over a year ago

I changed your answer (+1) to Matlab syntax (since it is a Matlab question), hope that's okay. Cheers.

laaph · Accepted Answer · 2012-12-06 07:27:46Z

5

What you want is

for i = 0:50:1050
    do_stuff(i);
end

unless, it is unclear from your question, if the previous answer is what you really want, which you might need in the case that looks like this

for i = 1:1060
    if mod(i, 50) == 0
        do_something(i)
    end
    do_something_else(i)
end

Cheers,--

answered Dec 6, 2012 at 7:27

laaph

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