Note that the Complete Tensor formula gives a left-handed result,
i.e., x-axis cross y-axis = negative z-axis
CT =: C.!.2 @ (#:i.) @ $~
ip=: +/ .*
crossCT=: [ ip CT@#@[ ip ]
1 0 0 crossCT 0 1 0
0 0 _1
while
cross=: ((1: |.[)*(_1: |. ]))-((_1: |.[)*(1:|.]))
1 0 0 cross 0 1 0
0 0 1
In the physical sciences, we tend to use right handed coordinates.
Patrick
On Sat, 8 Feb 2020, Don Guinn wrote:
https://code.jsoftware.com/wiki/Essays/Complete_Tensor#cross_product
On Sat, Feb 8, 2020 at 6:07 AM <[email protected]> wrote:
Dear list,
is there a concise way to calculate a cross product of 2 vectors
(in 3D, of course).
Thanks
Ruda
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