Dear Maithili,
Here are two suggestions:
# data set
x <- read.table(textConnection("Name no_of_instances
AAA 12
AA 17
A 0
BBB 11
BB 6
B 0
C 8
D 3"), header = TRUE)
closeAllConnections()
x
# option 1
do.call(c,with(x, tapply(no_of_instances, Name, runif)))
# option 2
with(x, runif( sum(no_of_instances) ))
HTH,
Jorge
On Tue, Dec 15, 2009 at 8:26 AM, Maithili Shiva <> wrote:
> Dear R helpers
>
> I have following table
>
> Name no_of_instances
> AAA 12
> AA 17
> A 0
> BBB 11
> BB 6
> B 0
> C 8
> D 3
>
> Now I need to generate the uniform random numbers (against the no. of
> instances) and assign these numbers generated against the respective names.
> E.g. I need to generate 12 random numbers and assign these numbers against
> AAA.
>
> Individually I can generate them as
>
> AAA_no = c(runif(12))
> AA_no = c(runif(17))
> ......
>
> and so on.
>
> And in the end I can club them as
>
> ran_nos = c(AAA_no, AA_no, ..........D_no)
>
> My problem is if there are say 1000 names, then it will be a cumbersome
> job to generate 1000 individual random number sets and then to combine them
> to form a single dataset.
>
> Is there any alternative to this?
>
> Thanking in advance
>
> With regards
>
> Maithili
>
>
>
>
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>
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