Thanks both of you for help!
This is my conclusion based on Rolf's and David's suggestion: (x=data.frame)
By for-looping over a data.frame and deleting certain rows with
x=x[-i,]
its better to collect all rows which need to be deleted in a vector and do
one final delete step:
collecting:
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
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,] --
On 10/07/11 12:12, David Winsemius wrote:
SNIP
Uhhh, you meant
drpidx - -c(5,10, i)
x - x[-drpidx, ]
cheers,
Rolf Turner
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R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting
On Jul 9, 2011, at 9:37 PM, Rolf Turner wrote:
On 10/07/11 12:12, David Winsemius wrote:
SNIP
Uhhh, you meant
drpidx - -c(5,10, i)
x - x[-drpidx, ]
Yes, I certainly did. Thanks for the correction.
cheers,
Rolf Turner
David Winsemius, MD
West Hartford, CT
On Jul 9, 2011, at 11:42 PM, David Winsemius wrote:
On Jul 9, 2011, at 9:37 PM, Rolf Turner wrote:
On 10/07/11 12:12, David Winsemius wrote:
SNIP
Uhhh, you meant
drpidx - -c(5,10, i)
x - x[-drpidx, ]
Yes, I certainly did. Thanks for the correction.
A little bird has tweeted that I
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