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

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Chuguang Pan
Chuguang Pan 2020-12-3
评论： Ameer Hamza 2020-12-3
syms x y z
vec1=[x y z];
vec2=[x y z];
cross(vec1,vec2)

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回答（1 个）

Ameer Hamza
Ameer Hamza 2020-12-3
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);
Result
>> x
x =
[0, 0, 0]
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Walter Roberson
Walter Roberson 2020-12-3
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 2020-12-3
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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