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2008 Jun 06
2
Merging two dataframes
Hi All,
Newbie question for you all but i have been looking at the archieves and the
help dtuff to get a rough idea of what i want to do
I would like to merge two dataframes together based on a keyed variable in
one dataframe linking to the other dataframe. Only some of the cases will
match but i would like to keep the others as well.
My dataframes have 67 and 28 cases respectively and i w...
2008 Jun 06
6
Subsetting to unique values
I want to take the first row of each unique ID value from a data frame.
For instance
> ddTable <-
data.frame(Id=c(1,1,2,2),name=c("Paul","Joe","Bob","Larry"))
I want a dataset that is
Id Name
1 Paul
2 Bob
> unique(ddTable)
Will give me all 4 rows, and
> unique(ddTable$Id)
Will give me c(1,2), but not accompanied by the name column.