Description Usage Arguments Details
Counting units tend to get treated as words rather than symbols, and thus have a lot of variant forms. Here, we parse these with regular expressions that should catch the most common ones. When we find a unit, we return the conversion factor to convert it to ones. For example, "thousands" -> 0.001. This allows us to construct the conversion from unit 'a' to unit 'b' by dividing val(b)/val(a). Note that an empty input string is treated as ones (i.e., if you don't specify a count, it's assumed to be ones).
1 |
unit |
The counting unit to convert. |
If we can't identify a unit, then we issue a warning and return NA. This
will cause unitconv_counts
to abort the unit conversion.
Right now we cover all of the units I've seen in the GCAM output, plus a few other obvious extensions, but there are many more possibilities. The units are matched by case-insensitive regular expression; the matches currently implemented are:
Ones
hundred[ -]?thous
Hundred thousands
hundred
Hundreds (the compound 'hundred thousands' is checked first so that this match will not capture it.)
thous
Thousands (including abbreviations like 'thous' or 'thousand')
mil
Millions, including abbreviations
bil
Billions, including abbreviations
tril
Trillions, including abbreviations. This is the largest unit we expect to see written out (instead of denoted with a metric prefix).
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