?merge
Sent from my iPhone
On Dec 10, 2008, at 15:17, "Bill McNeill (UW)"
<[EMAIL PROTECTED]> wrote:
I'm an R newbie trying to do an operation that seems like it should
be very
simple, but after much playing around with the interface and reading
"An
Introduction to R" I can figure out how to do it.
I have two text files. File1 contains:
type n
dog 2
cat 4
horse 6
File2 contains:
type n
horse 1
dog 3
cat 9
mouse 11
I want to read both files into R and multiply corresponding values
of n so
that I end up with:
dog 2*3 = 6
cat 4*9 = 36
horse 6*1 = 6
mouse 0*11 = 0
Note that the type rows are not necessarily in the same order in the
two
files, and that a missing type gets a default n = 0 value.
I figure the way to do this is use read.table and do the appropriate
manipulation of the factors, but I can't figure out what those
manipulations
would be. Basically I want to use a factor table as a hash table,
but I
haven't been able to figure out how to do this, which makes me think
I'm not
conceptualizing this is the correct R-ish way.
Thanks.
--
Bill McNeill
http://staff.washington.edu/billmcn/index.shtml
[[alternative HTML version deleted]]
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