On Oct 13, 2010, at 4:17 PM, Erik Iverson wrote:
Hello,
There are probably many ways to do this, but I think
it's easier if you use a data.frame as your object.
The easy solution for the matrix you provide is escaping
me at the moment.
Perhaps using sampling to derive an index?
A[ tapply(1
Try this:
A <- data.frame(V1 = rnorm(100), V2 = runif(100), V3 = rep(c(1,2,3,4,5),20))
do.call(cbind, lapply(aggregate(. ~ V3, A, FUN = sample, size = 5), c))
On Wed, Oct 13, 2010 at 5:01 PM, Mauricio Romero <
mauricio.rom...@quantil.com.co> wrote:
> Hi,
>
>
>
> I want to select a subsample from
Hello,
There are probably many ways to do this, but I think
it's easier if you use a data.frame as your object.
The easy solution for the matrix you provide is escaping
me at the moment.
One solution, using the plyr package:
library(plyr)
A <- data.frame(a = rnorm(100),b = runif(100), c = rep
Hi,
I want to select a subsample from my data, choosing one record from each
group. I know how to do this with a for.
For example: lets say I have the data:
A=cbind(rnorm(100),runif(100),(rep(c(1,2,3,4,5),20)))
Where the third column is the group variable. Then what I want is to select
5
4 matches
Mail list logo
