print {freegroup}

Print free objects

Description

Print methods for free objects

Usage

## S3 method for class 'free'
print(x,...)
as.character_free(m,latex=getOption("latex"))

Arguments

x

Object of class free in the print method

m

A two-row matrix in function as.character_free()

latex

Boolean, with TRUE meaning to print latex-friendly output including curly braces, and default NULL option meaning to give a nicer-looking output that latex would typeset incorrectly

...

Further arguments, currently ignored

Note

The print method does not change the internal representation of a free object, which is a list of integer matrices.

The default print method uses multiplicative notation (powers) which is inconsistent with the juxtaposition method “+”.

The print method has special dispensation for length-zero free objects but these are not handled entirely consistently.

The default print method uses lowercase letters a-z, but it is possible to override this using options("freegroup_symbols" = foo), where foo is a character vector. This is desirable if you have more than 26 symbols, because unallocated symbols appear as NA.

The package will allow the user to set options("freegroup_symbols") to unhelpful things like rep("a",20) without complaining (but don't actually do it, you crazy fool).

Author(s)

Robin K. S. Hankin

See Also

char_to_free

Examples

## default symbols:

abc(26)
rfree(1,10)


# if we need more than 26:
options(freegroup_symbols=state.name)
rfree(10,4)

# or even:
jj <- letters[1:10]
options(freegroup_symbols=apply(expand.grid(jj,jj),1,paste,collapse=""))
rfree(10,10,100,4)

options(freegroup_symbols=NULL)  #  NULL is interpreted as letters a-z
rfree(10,4)            #  back to normal