On Jul 9, 2011, at 7:02 PM, sven wrote:
Hello,
I am a student from Liverpool UK, working with some genetic data
using R.
I got a data.frame with about 250.000 rows and using a for loop to
delete
certain rows using the following code:
x <----- is a data.frame
x = x[-5,] ---> deletes row 5
x = x[-10,] ---> delets row 10
x = x[-i,] --> deletes row i
etc...
This takes ages for some reason. Isnt there a quicker way to do this?!
Two ways that would avoid repeated copying of medium size dataframes:
x <- x[-c(5,10, i) , ]
drpidx <- -c(5,10, i)
x <- x[-i, ]
--
David.
Cheers,
Sven
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David Winsemius, MD
West Hartford, CT
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