Provides a natural cross product for spray objects, useful for tensors
and
spraycross(S, ...)
spraycross2(S1,S2)Returns a spray object
spray objects
Robin K. S. Hankin
Tensor products for sprays. This is not an algebraic product of
sprays interpreted as multivariate polynomials. The function is used in
the stokes package, in which vignette tensorprod()
gives a use-case.
Function spraycross2() is a helper function that takes exactly
two arguments. Function spraycross() is a more general function
that takes any number of arguments.
a <- spray(matrix(1:4,2,2),c(2,5))
b <- spray(matrix(c(10,11,12,13),2,2),c(7,11))
a
b
spraycross2(a,b)
spraycross2(b,a)
spraycross(a,b,b)
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