spray (version 1.0-26)

print.spray: 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 spray
print(x, ...)
print_spray_matrixform(S)
print_spray_polyform(S,give=FALSE)
printedvalue(v)

Value

Returns its argument invisibly.

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()

v

Numeric vector

...

Further arguments (currently ignored)

Author

Robin K. S. Hankin

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.

Function printedvalue() is a low-level helper function that takes a numeric argument and returns the value as printed (thus respecting options scipen and digits).

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

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)