For loop and omitting every 10th step

Hello,

I am doing some Bayesian by running a Gibbs sampler. My issue is that I would like to omit (drop) the draws I get in every 10th repetition. So I was wondering whether there is any command or trick while I am using the FOR command, to ignore or jump the every 10th repetition. So for example:

for i=1:30

I would i to take values 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 21 22 23 24 25 26 27 28 29

Any idea? Many thanks

[Stephen23]

You should not use i or j as the loop variable name, as these are the names of the inbuilt imaginary unit .

Answer 1

[Image Analyst]

for i = 1 : 30
    if rem(i, 10) == 0
        continue;
    end
end

[Image Analyst]

Yet another way:

indexesToUse = [1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 21 22 23 24 25 26 27 28 29]
for i = indexesToUse
  fprintf('i = %d\n', i);
end

[Panty]

Clever answer..Thanks you very much 'Image'

[Panty]

Image, Inside my initial 'for' command I have other loops and calculations. How should I write the above trick, so that any time i=10,20,30 everything that is inside my 'for' loop be ignored.

[Image Analyst]

Either of those methods will work. The first one goes through all i but then skips to the end if it hits 10, 20, 30. Put your code after the if block. The second code never even takes on the values 10, 20, 30 so there is no problem, just put your code inside the loop.

[Panty]

So if I do it like:

 for i = 1 : 30
     if rem(i, 10) == 0
        continue;
     end
   for p=1:10
     ....
   end
     k=k+1
 end

So if i=10,20 or 30 then neither "for p=1:10" nor "k=k+1" will execute. Correct?

[Image Analyst]

Correct.

Answer 2

[David Young]

for i = floor(1:10/9:30)
  ...
end

[Panty]

Thank you very much David for the help. It seems clever as well.

[Stephen23]

Do not use i as the loop variable name, as this is the name of the inbuilt imaginary unit .

Answer 3

[Stephen23]

A = 1:30;
A(10:10:end) = [];
for a = A
    ....
end

[Panty]

Thank you Stephen. It looks helpful as well.