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Logical operator not evaluating correctly

5 vues (au cours des 30 derniers jours)
Andrew
Andrew le 26 Jan 2023
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?

Réponse acceptée

Star Strider
Star Strider le 26 Jan 2023
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
.

Plus de réponses (2)

Walter Roberson
Walter Roberson le 26 Jan 2023
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

Les Beckham
Les Beckham le 26 Jan 2023
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

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