R: Compute external- or 'cross'- product of 3D vectors.

extprod3d {geometry}

R Documentation

Compute external- or ‘cross’- product of 3D vectors.

Computes the external product

(x2 * y3 - x3 * y2, x3 * y1 - x1 * y3, x1 * y2 - x2 * y1)

of the 3D vectors in x and y.

extprod3d(x, y, drop = TRUE)

`x`	`n`-by-3 matrix. Each row is one x-vector
`y`	`n`-by-3 matrix. Each row is one y-vector
`drop`	logical. If `TRUE` and if the inputs are one row matrices or vectors, then delete the dimensions of the array returned.

If n is greater than 1 or drop is FALSE, n-by-3 matrix; if n is 1 and drop is TRUE, a vector of length 3.

Raoul Grasman