IF / ELSE Usage within For loop for Specific Iteration Only

Question

Sam 2014-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/115333-if-else-usage-within-for-loop-for-specific-iteration-only

评论： Jos (10584) 2014-2-10

采纳的回答： Azzi Abdelmalek

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When using a FOR LOOP can I do something like when

for i=1:1:15

When i iterates at 9, 10, 12 & 14 ONLY do an additional condition. Is it possible? Can i maybe add in an IF Condition? Would be good if i can sum up al the 4 possibilities within this 1 IF Statement. Thanks!

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Answer 1

Azzi Abdelmalek 2014-2-8

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for i=1:1:15
  if ismember(i,[9 10 12 14])
      % do
  end

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Answer 2

Jos (10584) 2014-2-9

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As a follow-up, if you only need to perform the statements within a for-loop when the iterator takes specific values, you can change the expression used in the for loop.

for k = 1:10
   if ismember(k, [2 5 8])
      % statements here 
   end
end

equals

for k = [2 5 8]
   % statements here
end

This neat feature of MatLabs for-loop is easily overlooked ...

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Azzi Abdelmalek 2014-2-9

Jos, I don't think that's what Sam asked for. He needs to do a for loop for i=1:15, but he wants to add some lines of code for specific values of i

Jos (10584) 2014-2-10

Yep, I know, (and that's why I posted it as a follow-up). It just serves to illustrate ML functionality when there are NO statements within the for-loop but outside the if-ismember section ...

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Answer 3

dpb 2014-2-8

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iskp=[9 10 12 14];
j=1;
for i=1:15
  if i==iskp(j) && j<=length(iskp)
    j=j+1;
    % do whatever else here
  end
  % rest here (or ahead of if if order-dependent)
  ...

If you can derive the condition for iskp values then you can have any other manner of generating the test as desired.

Also check out

doc switch
doc case

and friends as alternative structures that may be helpful

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Sam 2014-2-9

hi dpb! thanks for your answer i agree with it as well but i had went with the earlier one since it was simpler as i have a few functions i am calling for this segment of my work and i would prefer a simpler code so it will be easier to troubleshoot later..

Cheers...

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