The reshape2 package may be what you're looking for:
http://cran.r-project.org/web/packages/reshape2/index.html
install.packages("reshape2")
reshape2::melt(df)
On 2014-03-24 12:02, Tham Tran wrote:
Dears R Users,
I have another question on function "stack".
Given a data frame like:
df=data.frame(a=c(3,5),b=c(2,8),a=c(9,1),b=c(6,4),check.names=F)
a b a b
3 2 9 6
5 8 1 4
I would like to form a new data frame like:
values ind
1 3 a
2 5 a
3 2 b
4 8 b
5 9 a
6 1 a
7 6 b
8 4 b
I arrived with the script:
stack = function (x, ...)
{
x = as.list(x)
keep = unlist(lapply(x, is.vector))
if (!sum(keep))
stop("at least one vector element is required")
if (!all(keep))
warning("non-vector elements will be ignored")
x = x[keep]
data.frame(values = unlist(unname(x)), ind =
factor(rep.int(names(x),
lapply(x, length))), stringsAsFactors = FALSE, ...)
}
stack(df, check.names = FALSE)
Do you have any other simple manner to that?
Thanks in advance for your helps!
Tham
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