Ops.units {units} | R Documentation |
S3 Ops Group Generic Functions for units objects
Description
Ops functions for units objects, including comparison, product and divide, add, subtract.
Usage
## S3 method for class 'units'
Ops(e1, e2)
Arguments
e1 |
object of class |
e2 |
object of class |
Details
Users are advised against performing arithmetical operations with temperatures in different units. The units package ensure that results 1) are arithmetically correct, and 2) satisfy dimensional analysis, but could never ensure that results are physically meaningful. Temperature units are special because there is an absolute unit, Kelvin, and relative ones, Celsius and Fahrenheit degrees. Arithmetic operations between them are meaningless from the physical standpoint. Users are thus advised to convert all temperatures to Kelvin before operating.
Value
object of class units
Examples
a <- set_units(1:3, m/s)
b <- set_units(1:3, m/s)
a + b
a * b
a / b
a <- as_units("kg m-3")
b <- set_units(1, kg/m/m/m)
a + b
a = set_units(1:5, m)
a %/% a
a %/% set_units(2)
set_units(1:5, m^2) %/% set_units(2, m)
a %% a
a %% set_units(2)