vec_arith | R Documentation |
This generic provides a common double dispatch mechanism for all infix
operators (+
, -
, /
, *
, ^
, %%
, %/%
, !
, &
, |
). It is used
to power the default arithmetic and boolean operators for vctrs objects,
overcoming the limitations of the base Ops generic.
vec_arith(op, x, y, ...) ## Default S3 method: vec_arith(op, x, y, ...) ## S3 method for class 'logical' vec_arith(op, x, y, ...) ## S3 method for class 'numeric' vec_arith(op, x, y, ...) vec_arith_base(op, x, y) MISSING()
op |
An arithmetic operator as a string |
x, y |
A pair of vectors. For |
... |
These dots are for future extensions and must be empty. |
vec_arith_base()
is provided as a convenience for writing methods. It
recycles x
and y
to common length then calls the base operator with the
underlying vec_data()
.
vec_arith()
is also used in diff.vctrs_vctr()
method via -
.
stop_incompatible_op()
for signalling that an arithmetic
operation is not permitted/supported.
See vec_math()
for the equivalent for the unary mathematical
functions.
d <- as.Date("2018-01-01") dt <- as.POSIXct("2018-01-02 12:00") t <- as.difftime(12, unit = "hours") vec_arith("-", dt, 1) vec_arith("-", dt, t) vec_arith("-", dt, d) vec_arith("+", dt, 86400) vec_arith("+", dt, t) vec_arith("+", t, t) vec_arith("/", t, t) vec_arith("/", t, 2) vec_arith("*", t, 2)
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