# megengine.functional.cross¶

cross(a, b, axisa=- 1, axisb=- 1, axisc=- 1, axis=None)[源代码]

Return the cross product of two (arrays of) vectors.

The cross product of a and b in R^3 is a vector perpendicular to both a and b. If a and b are arrays of vectors, the vectors are defined by the last axis of a and b by default, and these axes can have dimensions 2 or 3. Where the dimension of either a or b is 2, the third component of the input vector is assumed to be zero and the cross product calculated accordingly.

• a (Tensor) – components of the first vector(s).

• b (Tensor) – components of the first vector(s).

• axisa (int) – axis of a that defines the vector(s). By default, the last axis.

• axisb (int) – axis of b that defines the vector(s). By default, the last axis.

• axisc (int) – axis of c containing the cross product vector(s). By default, the last axis.

• axis (Optional[int]) – if defined, the axis of a, b and c that defines the vector(s) and cross product(s). Overrides axisa, axisb and axisc.

Tensor

vector cross product(s).

>>> a = Tensor([1.0, 2.0, 3.0])
>>> b = Tensor([4.0, 5.0, 6.0])
>>> out = F.cross(a, b)
>>> out.numpy()
array([-3.,  6., -3.], dtype=float32)