Hi:
Here's another approach:
library(reshape)
l <- list(a1, a2, a3, a4)
ll <- melt(l)
ll[ll$value %in% i, 'L1']
# [1] 1 3
HTH,
Dennis
On Thu, Jun 17, 2010 at 4:40 PM, song song wrote:
> for example, I have
>
> a1=c(1,3,5)
> a2=c(2,4,6)
> a3=c(7,8)
> a4=c(9,10)
>
> now if I have i=5, so i in a
You could try this:
i <- c(5, 8)
a <- list(a1, a2, a3, a4)
subset(stack(as.data.frame(sapply(a, '[', 1:max(sapply(a, length),
values %in% i, ind)
On Thu, Jun 17, 2010 at 8:40 PM, song song wrote:
> for example, I have
>
> a1=c(1,3,5)
> a2=c(2,4,6)
> a3=c(7,8)
> a4=c(9,10)
>
> now if
song song wrote:
for example, I have
a1=c(1,3,5)
a2=c(2,4,6)
a3=c(7,8)
a4=c(9,10)
now if I have i=5, so i in a1, then I get a feedback tag[5]=1
i=8, so i in a3, then can get tag[8]=3
in there any function to do this to check the element belongs to which
group?
thank you!!!
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