On Apr 20, 2010, at 7:32 AM, venkata kirankumar wrote:
Hi all,
I have a problem with retreaving column from a data.frame that is
I have a data.frame named "temp"
in that dataframe some column are there whose names are
"IDENTIFIER" "UNIQUEID" "TRIALGROUPSID" "GRPNUMBER"
"GRPDESC" "SEXDID" "STDID" "STUDYTYPE"
"SDID" "DOSDID" "SOPDID" "SPECIES"
i can retreave any column with using command like "temp$STDID"
but my problem is the column name i have to get from another xml its
comming like "STDID"
that one i assigned to a variable named "kk" like kk<-"STDID"
but now while i am trying to retreave this column from dataframe temp
like temp$kk or
with using command paste like
paste("temp",kk,sep"$")
both the times its giving null result
but its having values in table
Don't use the "$" operator for such tasks. Instead use the indexing
operator "[":
temp[ , kk]
> testdf <- data.frame(aa=letters[1:10], bb=LETTERS[1:10], cc=1:10)
> colname <- "aa"
> testdf[ , colname]
[1] a b c d e f g h i j
Levels: a b c d e f g h i j
-- David.
can any one help me how to get column values from dataframe like
these cases
thanks in advance
kiran
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