show: Print method for onions

Description

Show methods for onions

Usage

# S4 method for onion
show(object)
onion_show(x,
     comp = getOption("show_onions_compactly"),
     h    = getOption("show_onions_horizontally")
)
comp_names(x)

Arguments

x,object: Onions
comp: Boolean, with TRUE meaning to print onions compactly and any other value to print in matrix form
h: Boolean, with TRUE meaning to print by columns and any other value meaning to print horizontally

Author

Robin K. S. Hankin

Details

Default behaviour is to print by rows. To print by columns, set option show_onions_horizontally to TRUE:

options("show_onions_horizontally" = TRUE)

Any non-TRUE value (including NULL and its being unset) will restore the default.

Similarly, to show onions compactly, set option show_onions_compactly to TRUE:

options("show_onions_compactly" = TRUE)

This option works best for simple onions with integer entries (or at least values with few decimal places), and especially if there are many zero entries.

Function onion_show() is a helper function, not really intended for the end-user.

The “names” of the components of an onion (viz Re, i, j, k for quaternions and Re, i, j, k, l,il,jl,kl for octonions) are given by function comp_names() which takes either a character string or an onion.

Examples

Run this code



x <- roct(15)
x  #default

options("show_onions_horizontally" = TRUE)
roct(4) 

options("show_onions_horizontally" = FALSE)  # restore default

options("show_onions_compactly" = TRUE)
x <- as.quaternion(matrix(sample(c(0,0,0,-1,1),80,replace=TRUE),4,20))
options("show_onions_compactly" = FALSE) # restore default