Vector products: Difference between revisions
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An alternative definition for cross (based on finding the determinant of a 3 by 3 matrix where one row is unit vectors) could be:
<lang j>cross=: [: > [: -&.>/ .(*&.>) (<"1=i.3) , ,:&:(<"0)</lang>
With an implementation of cross product, the rest of the task becomes trivial:
<lang j>a=: 3 4 5
b=: 4 3 5
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