find something strange when using rot90. the matrix are not equal nor equal. In this case 33 appears in the answer.

A=randi(2,3,3);

B=rot90(A);

if A==B

11

elseif A~=B

22

else

33

end

Answer 1

[Walter Roberson]

http://www.mathworks.com/help/matlab/ref/if.html

An evaluated expression is true when the result is nonempty and contains all nonzero elements (logical or real numeric). Otherwise, the expression is false.

The A==B is not true because there is at least one element that does not match. The A=~B is not true because there is at least one element that does match. So you get the third possibility.

[Henry]

thank you!!!

Answer 2

[Dishant Arora]

A and B are matrices not scalar compare them using isequal. Try this

if isequal(A,B)
    % do something
elseif ~isequal(A,B)
    % do something

And to know what you did wrong in your code type this:

A==B

[Henry]

also thx