if statement and "equal to" problem

Hello everybody. I have a simple "if statement with equal to" and I would like to set a list of value instead of just one. Maybe the example will clarify my problem:

    for j=1:length(POS_S)
    for i=1:length(POS_C)
  if (POS_S(j) == 7,8,9) AND ((POS_C(i) == POS_S(j)+1) OR (POS_C(i) == POS_S(j)-1)) AND (POS_C(i) ~= 2,3,4);
....
end

I receive the following error:

Error: Unexpected MATLAB expression.

Anyone who can help me? Where I'm wrong? Is it possible put a list values after "==" and "~=" ?

Answer 1

[Image Analyst]

Use double ampersand, &&, instead of the word AND.

[Image Analyst]

and double vertical bar instead of the work "OR".

[John D'Errico]

Funny. I completely missed the use of OR and AND in that line of code. Again, not valid MATLAB syntax.

Answer 2

[John D'Errico]

This is not valid MATLAB syntax:

 (POS_S(j) == 7,8,9)

At least, it won't do what you obviously desire it to do. Making up syntax on your own rarely is successful.

You might consider using ismember instead. You could also have used three explicit tests, with an or between them. (Thus the | | operator.)

[Image Analyst]

Maybe use ismember() or any() or all()