Tells the units package how to convert between units that
have a linear relationship, i.e. can be related on the form \(y = \alpha
x\) (constant) or \(y = \alpha + x\) (offset).
install_conversion_constant(from, to, const)install_conversion_offset(from, to, const)
String for the symbol of the unit being converted from.
String for the symbol of the unit being converted to. One of
from and to must be an existing unit name.
The constant \(\alpha\) 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 \(y = \alpha x\). Using this function, you specify that you
can go from values of type from to values of type to by
multiplying by a constant, or adding a constant.