Why does can't I assign number greater than 1 to a matrix?

Why is value (2,2) of this matrix getting assigned to 1 instead of 9 in this console output? How can I make it take values greater than 1?

>> myMat = ~eye(3)

myMat =

       0     1     1
       1     0     1
       1     1     0

>> myMat(2,2) = 9

myMat =

       0     1     1
       1     1     1
       1     1     0

Answer 1

[Paolo]

~eye(3) returns a logical array. You must convert it to double. Use:

 logicalMat = ~eye(3);
 myMat = double(logicalMat);
 myMat(2,2) = 9;