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MATLAB function cross can be applied to symbolic object but Documentation does not explain?

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syms x y z
vec1=[x y z];
vec2=[x y z];

Answers (1)

Ameer Hamza
Ameer Hamza on 3 Dec 2020
It works fine in R2020b, are you using an older release?
syms x y z
vec1 = [x y z];
vec2 = [x y z];
x = cross(vec1, vec2);
>> x
x =
[0, 0, 0]
Walter Roberson
Walter Roberson on 3 Dec 2020
Especially back in those days, a lot of the numeric functions did not check specifically that their arguments were numeric. They just went ahead with the calculations, and if the calculations happened to involve an operation not possible on the variable type you were using, you would get an error in that particular operation.
Ameer Hamza
Ameer Hamza on 3 Dec 2020
Also, inside cross.m file, it specifically mentions that it supports single and double classes. However, it works fine for other datatypes too
>> a = randi(10, 1, 3);
b = randi(10, 1, 3);
>> cross(a, b)
ans =
-14 37 -10
>> cross(int8(a), b)
ans =
1×3 int8 row vector
-14 37 -10

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