Hello, I have the following task I'd like to accomplish:
A file contains 5 columns of data (several hundred rows), let's call
them a, b, c, d and e (ie these are their column headers)
I also have a set of definitions, e.g.,
f = a + b
g = a * 3
h = c + d
etc.
I would like to write out a new .rda file that contains columns
a b c d e f g h etc.
I.e. , the original data plus new columns (with headers and data).
It seems that there ought to be a simple way to do this, could
someone provide some guidance on the best way to accomplish
this task? (I tried a few things as this seemed rather trivial,
but did not succeed. I still hope/assume this is a trivial thing
to do if one knows R well)
Thanks,
Esmail
ps: I want to thank everyone again who posted their solutions
to my previous query. Seeing different solutions for the same
problem is a tremendously effective way to learn something
new.
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