Looping if between 2 numbers

I am trying to create a for loop that will only loop if x is between two number like 0<=x & x>= 12, but when I use the & symbol it does not work.

Answer 1

[Jeffrey Clark]

@jason, the and operator (&) produces a logical (true/false 1/0) result - not a range of values. Please look at MATLAB documentation and specifically Find logical AND - MATLAB and & (mathworks.com) and for loop to repeat specified number of times - MATLAB for (mathworks.com)

[Jeffrey Clark]

@jason, perhaps you are saying loop between values but intend to while loop for your indicated range of x (especially if x is a non integer value) example:

x = someScalar; % not an array
while 0<=x & x<=12 % you really want to continue when less or equal to 12 not x>=12
    % do something to change x
    if wantToBreakOutEarly
        break
    end
end
% will reach this point if ~(0<=x & x<=12) | wantToBreakOutEarly

Answer 2

[John D'Errico]

As @Jeffrey Clark said, the & operator is a LOGICAL operator. Perhaps what you want to do is have a loop over a discontigous domain? For example, you can do this:

S = [-5:0, 12:15];
for s = S
  disp(s)
end

    -5

    -4

    -3

    -2

    -1

     0

    12

    13

    14

    15

Is that what you were looking to do?

No, as I re-read your question, I think it is not.

You asked about a loop that ONLY operates when X is in some interval. And that surely means a while loop. So you can do this:

x = randi(18) - 3;
while (x >= 0) && (x <= 12)
  disp(x)
  x = randi(18) - 3;
end

     1

     6

     4

    12

     8

     3

     8

    10

     0

    12

     9

    11

     7

     8

     7

    10

disp("final value of x that failed: " + x)

final value of x that failed: 15

So as long as x remains in the interval of interest, the loop continues. Is that what you want?