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Date: Wed, 03 Mar 2004 21:46:27 -0600
From: Marc Schwartz [EMAIL PROTECTED]
To: Greg Blevins [EMAIL PROTECTED]
Cc: R-Help [EMAIL PROTECTED]
Subject: Re: [R] A file manipulation question
[...]
aggregate(df$Contract, list(ID = df$ID), max)
ID x
1 01 1
2 02 3
3 03
Hello R experts,
The following problem outstrips my current programming knowledge.
I have a dataframe with two fields that looks like the following:
ID Contract
01 1
01 1
02 2
02 3
02 1
03 2
03 2
03 2
03 1
03 1
03 1
etc...
I would
How about something like ... (if your data frame is called the.data)
summarized - as.data.frame(levels(the.data$ID))
names(summarized) - ID
summarized$Contract - as.numeric(tapply(the.data$Contract, the.data$ID, max))
Andrew
On Wednesday 03 March 2004 19:19, Greg Blevins wrote:
Hello R
On Wed, 2004-03-03 at 21:19, Greg Blevins wrote:
Hello R experts,
The following problem outstrips my current programming knowledge.
I have a dataframe with two fields that looks like the following:
ID Contract
01 1
01 1
02 2
02 3
02 1
03 2
03 2
03
Say your data frame is `dat'. Try:
tapply(dat$Contract, dat$ID, max)
(The output is not a data frame, but that shouldn't be a problem...)
HTH,
Andy
From: Greg Blevins
Hello R experts,
The following problem outstrips my current programming knowledge.
I have a dataframe with two
]
Cc: R-Help [EMAIL PROTECTED]
Subject: Re: [R] A file manipulation question
[...]
aggregate(df$Contract, list(ID = df$ID), max)
ID x
1 01 1
2 02 3
3 03 2
See ?aggregate for more information. By default, aggregate() names the
function derived column as 'x'. You can of course rename
