FOR loop and keep every 10th iteration

Hi,

I am looking for a tricky command which I can use it inside a 'for' loop which will enables me to allow the loop works in every 10th step.

For example:

 k=0
 for i=1:30

 (command)

    k=k+1
 end

So at the end of the 'for' loop I want k=3.

Any idea?? Many thanks!!

Answer 1

[Chad Greene]

A few things:

First, try to avoid using i as a variable, because by default in Matlab i = sqrt(-1). I'm going to switch your i to n.

As you've set up your loop, k and i will always be the same. Why not just use,

for n = 1:10:30
   (commands) 
end

If you need to run the loop for n = 1:30 (the same thing as n = 1:1:30), but you want to do some special commands when n = 1, 11, and 21, consider using mod.

for n = 1:10:30 
   (commands) 
   if mod(n,10)==1
      (do something fancy) 
   end
end

[Panty]

Thank you Chad. It looks fine.

[Panty]

Chad, using exactly your 2nd example, if I want to do some special commands when n=10,20,30 how can i write the mod command??

Thanks

[Stephen23]

mod(n,10)==0

[Chad Greene]

...What Stephen said.

Here's more on mod: http://www.mathworks.com/help/matlab/ref/mod.html