units package how to convert between units that
have a linear relationship, i.e. can be related on the form y = α
x (constant) or y = α + x (offset).
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String for the symbol of the unit being converted from.
String for the symbol of the unit being converted to. One of
The constant α in the conversion.
This function handles the very common case where units are related
through a linear function, that is, you can convert from one to the other
as y = α x. Using this function, you specify that you
can go from values of type
from to values of type
multiplying by a constant, or adding a constant.
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# one orange is worth two apples install_symbolic_unit("orange") install_conversion_constant("orange", "apple", 2) # apple = 2 * orange apples <- 2 * as_units("apple") oranges <- 1 * as_units("orange") apples + oranges oranges + apples install_conversion_offset("meter", "newmeter", 1) m = set_units(1:3, meter) n = set_units(1:3, newmeter) m + n n + m
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