[R] "Delete row" takes ages. alternative?!

[sven]

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?!
Cheers,
Sven


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