spray (version 1.0-16)

spraycross: Cross product for spray objects

Description

Provides a natural cross product for spray objects, useful for tensors and \(k\)-forms

Usage

spraycross(S, ...)
spraycross2(S1,S2)

Arguments

S,S1,S2,...

spray objects

Value

Returns a spray object

Details

Cross products for sprays. This is not an algebraic product of sprays interpreted as multivariate polynomials. The function is used in the stokes package.

Function spraycross2() is a helper function that takes exactly two arguments. Function spraycross() is a more general function that takes any number of arguments.

Examples

# NOT RUN {
a <- spray(matrix(1:4,2,2),c(2,5))
b <- spray(matrix(c(10,11,12,13),2,2),c(7,11))

spraycross2(a,b)
spraycross2(b,a)

spraycross(a,b,b)

# }