print.spray {spray} | R Documentation |
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)
printedvalue(v)
Arguments
x , S |
spray object |
give |
Boolean, with default |
v |
Numeric vector |
... |
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.
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.
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.
There are no checks for option sprayvars
being sensible. For
example, repeated entries, or entries with zero length, are acceptable
but the output might be confusing or uninformative.
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)