identity | R Documentation |
Create and test for the identity element
is.id(x) id(n) ## S3 method for class 'free' is.id(x)
x |
Object of class |
n |
Strictly positive integer |
Function id()
returns a vector of n
free objects, all of
which are the identity element. Do not ask what happens if n=0.
Function is.id()
returns a Boolean indicating whether an element
is the identity or not. The identity can also be generated using
as.free(0)
.
Robin K. S. Hankin
id() as.free(0) # convenient R idiom for creating the identity x <- rfree(10,3) stopifnot(all(x == x + as.free(0))) stopifnot(all(is.id(x-x)))
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