Many thanks to David L Carlson, Ben Gunter and David Winsemius for your quick
and very elegant solutions!!
With your list answers I am learning sa lot of things that will help me in the
future to program.
Best,
Frank S.
> Subject: Re: [R] Random selection of a fixed number of values
> On Dec 14, 2015, at 12:46 PM, David L Carlson wrote:
>
> There are lots of ways to do this. For example,
Another method with mapply:
mapply(function( n, vals) {sample(vals$id, n)} , # no replacement is the
default for sample
vals= split(data, findInterval(data$value, 0:5) )[1
Yes.
May I suggest:
grp <- c("[0,1)", "[1,2)", "[2,3)", "[3,4)", "[4,5)")
can be obtained more simply as
grp <- levels(groups)[1:5]
and one slight aesthetic change in the indexing:
from:
samples <- lapply(1:5, function(x) sample(data$id[groups==grp[x]], size[x]))
to:
samples <- lapply(1:5, f
There are lots of ways to do this. For example,
> groups <- cut(data$value, include.lowest = T, right = FALSE,
+ breaks = 0:ceiling(max(data$value)))
> grp <- c("[0,1)", "[1,2)", "[2,3)", "[3,4)", "[4,5)")
> size <- c(10, 7, 5, 5, 3)
> set.seed(42)
> samples <- lapply(1:5, function(x) sample(
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