On 10/16/2008 1:27 AM, Lijiang Guo wrote:
> Dear R-helpers,
>
> I have a data frame with 3 variables, each record is a unique combination of
> the three variables. I would like to count the number of unique values of v3
> in each v1, and save it as a new variable v4 in the same data frame.
> e.g.
How about this:
> df1=data.frame(v1=c(1,1,2,3,2,4,1))
> df1$v2 <- ave(df1$v1,df1$v1,FUN=length)
> df1
v1 v2
1 1 3
2 1 3
3 2 2
4 3 1
5 2 2
6 4 1
7 1 3
On Thu, Oct 16, 2008 at 1:27 PM, Lijiang Guo <[EMAIL PROTECTED]> wrote:
> Dear R-helpers,
>
> I have a data frame with 3 variables
On Oct 16, 2008, at 1:27 AM, Lijiang Guo wrote:
Dear R-helpers,
I have a data frame with 3 variables, each record is a unique
combination of
the three variables. I would like to count the number of unique
values of v3
in each v1, and save it as a new variable v4 in the same data frame.
e.
Dear R-helpers,
I have a data frame with 3 variables, each record is a unique combination of
the three variables. I would like to count the number of unique values of v3
in each v1, and save it as a new variable v4 in the same data frame.
e.g.
df1
[v1] [v2] [v3]
[1,] "a" "C" "1"
[2,] "b" "
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