On Sep 26, 2011, at 4:16 PM, Khanvilkar, Shashank wrote:
Sending it again, with correct subject line.
Hello All,
Thanks in advance for all help,
I am trying to read a two column csv file in R, which looks like:
X,1
Y,2
Z,3
I am using R commands:
tmp = read.csv("test.csv", colClasses=c("character", "character"))
How can make this into a hash table,
Not sure about hash tables. Doubt you are quite ready for them. After
you learn a bit more R you can try to set up environments.
so that I can access, tmp["X"] and it will return me "1"?
Actually you cannot with your current object. You have read it in with
the default settings for read.csv, so now R "thinks" your column names
are "X" and "X.1". before you correct that problem, try:
str(tmp)
You should use header=FALSE in your corrective efforts, since you
don't have a header. Then you can say:
tmp[ which(tmp$V1 == "X") , "V2"] and get 1
You could also take the first column and assign those values to
rownames(tmp) and then be able to access that '1' with:
tmp["X", 2]
(And I see that Gabor has shown you how to do something similar with a
named vector).
With his example my suggestion was:
> rownames(DF) <- DF$letters
> DF["X", 2]
[1] 1
--
David Winsemius, MD
West Hartford, CT
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