logical operation on a varable x

For j=1:20
Here if j=1 or j=20 should not proceed further so how to write a code in for loop
End

[Azzi Abdelmalek]

What do you mean?

Answer 1

[Star Strider]

Taking a wild guess:

for k1 = 1:20
    if (k1 == 1) | (k1 == 20)
        continue
    end
    % Do Something 
end

If k1 is 1 or 20, the loop continues to the next iteration without doing anything after the if block. Otherwise, it continues to do whatever is in the loop.

[Guillaume]

This, of course, could be simply written as

for k2 = 2:19
    %do something
end

So, I'm not sure why the OP is asking the question.

[Star Strider]

My guess is that at 1 and 20 it does only one set of operations, and in between, other operations as well. We don’t know the details.

Answer 2

[Hugo]

Is this what you are looking for?

for j = 1:20
  if j==1 || j==20, continue; end
  your_code_goes_here
end

This executes everything after the if except when j is 1 or 20.

Answer 3

[Joep]

You mean something like this because your question is not clear

while stoploop=0
      stoploop=j==1|j==20
end

A test you can see it is only true on 1 and 20

for j=1:20
    stoploop(j)=j==1|j==20
end