If a conversion includes units other than these seven, it is not a base unit conversion.
(credit to anonymous poster)
[10.3] Remove units from numbers
Suppose x is a number with an associated unit, for example, 1.2_m. To extract just the numeric value,
use
part(x,1)
To extract just the units, use
part(x,2)
For example,
part(1.2_m,1) returns 1.2
part(1.2_m,2) returns 1*_m
This also works for compound units, for example
part(1.2_m*_s/_mol,2) returns
1$_m$_s
1$_mol
[10.4] Add units to undefined variables
Units can be applied to variables and expressions, as well as to numbers. For example, to create a
variable tf with units of °F, use
tf*_°F
The important point is to explicitly multiply the variable name by the units. This is not necessary when
applying units to numbers. A domain error message results if you do not use the explicit multiplication.
The example above gives different results, depending on the value of tf:
If tf is undefined:
tf·_°F
If tf is a number, like 12: 12·_°F
If tf is another variable name, like tf2: tf2·_°F
[10.5] Use tmpcnv() to display temperature conversion equations
tmpcnv() usually performs temperature conversion on numbers, for example
tmpcnv(0_°C,_°F)
results in 32_°F. You can also use tmpcnv() to display the temperature conversion equations, if you
convert an undefined variable, like this:
10 - 2
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