Note that these methods don't 'delete' observations.
They all create brand new objects that are
subsets of the test.df object. You can effectively
'delete' the observations by replacing the original
data.frame with the returned object...
so
test.df <- head(test.df, 20)
Erik Iverson wrote:
It depends on which 20 you want.
If you have a data.frame called 'test.df', you can do:
#first 20
test.df[20, ]
-or-
head(test.df, 20)
#random 20
test.df[sample(nrow(test.df), 20), ]
None of this was tested, but it should be a start.
--Erik
Matevž Pavlič wrote:
Hi,
I am sure that can be done in R....
How would i delete all but let say 20 observations in data.frame?
Thank you, M
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