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broman
2010 Dec 26
4
Parsing a Simple Chemical Formula
...ot;Hill order" which is to
list C, then H, then all other elements in alphabetical order. My
example will have only a limited number of elements, few enough that
one can search directly for each element. So some examples would be
C5H12, or C5H12O or C5H11BrO (note that for oxygen and bromine, O or
Br, there is no following number meaning a 1 is implied).
Let's say
> form <- "C5H11BrO"
I'd like to get the count of each element, so in this case I need to
extract C and 5, H and 11, Br and 1, O and 1 (I want to calculate the
molecular weight by mulitplyin...