[R] union of two data frames
Erik Iverson
iverson at biostat.wisc.edu
Mon Feb 25 23:13:08 CET 2008
Perhaps this example might help you?
I create 2 sample data.frames, take a look at what they contain and then
what the merge function gives. Compare with all = FALSE.
df1 <- data.frame(a = 1:10, b = 11:20)
df2 <- data.frame(a = c(1:2,98), b = c(11:12, 99))
merge(df1, df2, all = TRUE)
Erik Iverson wrote:
> You probably need to provide an example here, show us your data.frame
> column names, and what you mean by 'common subset of the same data' at
> least. What did you try and what did it do that you didn't expect?
>
> stephen sefick wrote:
>> I have a thirty thousand row data frame imported from excel and a
>> 60,000 row data frame imported from excel. they share a common subset
>> of the same data and I would like to combine the two into one data
>> frame merged together on the data in common. I have looked at the
>> help file for merge and intersect and cbind and rbind etc... And I
>> can't figure it out. Thanks in advance
>>
>> Stephen
>>
>
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