x2,by =list(myx$x1),max)
> Error in Summary.factor(c(4L, 1L), na.rm = FALSE) :
> max not meaningful for factors
>
> Thank you.
>
>
> --- On Thu, 10/23/08, jim holtman <[EMAIL PROTECTED]> wrote:
>
>> From: jim holtman <[EMAIL PROTECTED]>
>> Subject: Re: [R
t meaningful for factors
Thank you.
--- On Thu, 10/23/08, jim holtman <[EMAIL PROTECTED]> wrote:
> From: jim holtman <[EMAIL PROTECTED]>
> Subject: Re: [R] finding unique and max value from a data.frame
> To: [EMAIL PROTECTED]
> Cc: [EMAIL PROTECTED]
> Date: Thursday,
?aggregate
x1 x2
1 a 4
2 b 3
3 c 2
4 a 1
5 c 2
6 f 3
7 g 4
8 f 5
> aggregate(x$x2, list(x$x1), max)
Group.1 x
1 a 4
2 b 3
3 c 2
4 f 5
5 g 4
>
On Thu, Oct 23, 2008 at 8:30 PM, Srinivas Iyyer
<[EMAIL PROTECTED]> wrote:
> Hi group,
>
> How can I ide
Hi group,
How can I identify an element with max value among duplicated elements all in a
data frame
Example:
> x1
x1 x2
1 a 4
2 b 3
3 c 2
4 a 1
5 c 2
6 f 3
7 g 4
8 f 5
I want to be able to get a data frame with all unique(x1) with max value
x1 x2
1 a 4
2 b 3
3 c 2
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