mistake how can i stop

mistake loop needed, sorry

[per isakson]

Homework?

mod(x,2) = 1

I think you mean

mod(x,2) == 1

See eq, ==

Answer 1

[Jim Riggs]

You probably want a loop from X=100:200

Inside your loop, you select the cases you want: e.g.

for x=100:200
   condition1 = mod(x,2)==1 ;  % odd number
   condition2 = mod(x,11)==0;  % multiple of 11
   condition3 = mod(x,13)==0;  % multiple of 13
   if condition1 && (condition2 || condition3)
       % this is the one you want
   end
end

[Jim Riggs]

use a counter to keep track of the values that you want:

count=0;
for x=100:200
    condition1 = mod(x,2)==1;   % odd number
    condition2 = mod(x,11)==0;  % multiple of 11
    condition3 = mod(x,13)==0;  % multiple of 13
    if condition1 && (condition2 || condition3)
        count=coumt+1;
        A(count)=x;
    end
end

At the end of this loop, "count" is the number of values stored in A.