Logical operator not evaluating correctly

Given the provided array X, create an array Y that is:

equal to 0 if the corresponding element of X is between -5 and +5, inclusive

equal to -1 if the corresponding element of X is less than -5

equalt to +1 if the corresponding element of X is greater than 5

Here is what I have:

Y = (~(X >= -5 & X <= 5) | (-1*(X < -5)) | (X>5)).

Why is the X < -5 not evaluationg to -1?

Answer 1

[Star Strider]

Only two comparisons are actually required here —

X = linspace(-7, 7, 15);
Y = -(X < -5) + (X > 5);

Check_Result = [X; Y]

Check_Result = 2×15

-7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 -1 -1 0 0 0 0 0 0 0 0 0 0 0 1 1

.

Answer 2

[Walter Roberson]

A|B is an or test and returns a logical value -1 is nonzero which is considered true, and since you or everything together you are going to end up with logical true for those entries.

Try adding the results of the computation

Answer 3

[Les Beckham]

I would do this in separate steps.

X = randi([-20, 20], [1 15])

X = 1×15

3 -6 2 6 -7 -8 -7 13 17 -3 5 -13 -17 5 -1

Y = zeros(size(X));
Y(X < -5) = -1;
Y(X > 5) = 1

Y = 1×15

0 -1 0 1 -1 -1 -1 1 1 0 0 -1 -1 0 0