clifford (version 1.0-2)

term: Deal with terms

Description

By basis vector, I mean one of the basis vectors of the underlying vector space \(R^n\), that is, an element of the set \(\left\{e_1,\ldots,e_n\right\}\). A term (sometimes a basis blade or simple blade is a wedge product of basis vectors (or a geometric product of linearly independent basis vectors), something like \(e_{12}\) or \(e_{12569}\).

From Perwass: a blade is the outer product of a number of 1-vectors (or, equivalently, the wedge product of linearly independent 1-vectors). Thus \(e_{12}=e_1\wedge e_2\) and \(e_{12} + e_{13}=e_1\wedge(e_2+e_3)\) are blades, but \(e_{12} + e_{34}\) is not.

Function is.blade() is not currently implemented: there is no easy way to detect whether a Clifford object is a product of 1-vectors.

Usage

terms(x)
is.blade(x)
is.basisblade(x)

Arguments

x

Object of class clifford

Details

• Functions terms() and coeffs() are the extraction methods. These are unordered vectors but the ordering is consistent between them (an extended discussion of this phenomenon is presented in the mvp package).

• Function term() returns clifford object that comprises a single term with unit coefficient.

• Function is.basisterm() returns TRUE if its argument has only a single term, or is a nonzero scalar; the zero clifford object is not considered to be a basis term.

References

C. Perwass. “Geometric algebra with applications in engineering”. Springer, 2009.

See Also

clifford

Examples

# NOT RUN {
x <- rcliff()
terms(x)

is.basisblade(x)


a <- as.1vector(1:3)
b <- as.1vector(c(0,0,0,12,13))

a %^% b # a blade

# }