[R] HELP!! how to remove 10% of data randomly in R

[arun]

Hi,
Try this:
dat1<-read.table(text="
  V1 V2
1 5 10
2 6  3
3 8  4
4 9 20
5 15 30
6 25 40
7 2  4
8 3  1
9 1  5
10 8 10
",header=TRUE)
dat1[sample(1:nrow(dat1), 0.50*nrow(dat1)),] #50% of data
#   V1 V2
#4   9 20
#6  25 40
#8   3  1
#10  8 10
#9   1  5
dat1[-sample(1:nrow(dat1), 0.90*nrow(dat1)),] #remove 90% of data
#  V1 V2
#7  2  4




----- Original Message -----
From: Eugenie <leemeanwei at hotmail.com>
To: r-help at r-project.org
Cc: 
Sent: Tuesday, October 30, 2012 11:12 AM
Subject: [R] HELP!! how to remove 10% of data randomly in R

any can please tell me how to remove 10%,15%,25% and 50% of the data randomly
by using R programme???
can anyone please show me the coding?
do i need to install any package?



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