print: Print methods for spray objects

In spray: Sparse Arrays and Multivariate Polynomials

Print methods for spray objects

Description

Print methods for spray objects with options for printing in matrix form or multivariate polynomial form

Usage

## S3 method for class 'spray'
print(x, ...)
print_spray_matrixform(S)
print_spray_polyform(S,give=FALSE)

Arguments

x,S	spray object
give	Boolean, with default FALSE meaning to print the value of S, and TRUE meaning to return a string (without nice formatting); used in as.character.spray()
...	Further arguments (currently ignored)

Details

The print method, print.spray(), dispatches to helper functions print_spray_matrixform() and print_spray_polyform() depending on the value of option polyform; see the examples section.

Option sprayvars is a character vector with entries corresponding to the variable names for printing. The sprayvars option has no algebraic significance: all it does is affect the print method.

Note that printing a spray object (in either matrix form or polynomial form) generally takes much longer than calculating it.

Value

Returns its argument invisibly.

Note

There are a couple of hard-wired symbols for multiplication and equality which are defined near the top of the helper functions.

Author(s)

Robin K. S. Hankin

Examples

(a <- spray(diag(3)))


options(polyform = FALSE)
a^3

options(polyform = TRUE)
a^3


options(sprayvars=letters)
a <- diag(26)
spray(a)

## Following example from mpoly:
a[1 + cbind(0:25, 1:26) %% 26] <- 2
spray(a)

spray documentation built on Aug. 10, 2023, 5:11 p.m.