Peter,
After I made a small modification it worked:
with(dat, ave(x1, subject, FUN=cumsum))
But what's the use of with?
If I use ave(x1, subject, FUN=cumsum), I get the same result?
Bart
----- Original Message -----
From: "Bart Joosen" <[EMAIL PROTECTED]>
To: "Peter Dalgaard" <[EMAIL PROTECTED]>
Cc: <r-help@r-project.org>
Sent: Monday, November 24, 2008 7:29 PM
Subject: Re: [R] count the cumulative for each subject
Peter,
I actually took a look at the ave function, but couldn't manage to get it
right.
But when I try your code, I get "Error in as.vector(x, mode) : invalid
argument 'mode'".
Any ideas?
Bart
----- Original Message -----
From: "Peter Dalgaard" <[EMAIL PROTECTED]>
To: "bartjoosen" <[EMAIL PROTECTED]>
Cc: <r-help@r-project.org>
Sent: Monday, November 24, 2008 3:42 PM
Subject: Re: [R] count the cumulative for each subject
bartjoosen wrote:
How about:
tapply(dat$x1,dat$subject,function(x) cumsum(x))
which gives you a list for each subject.
this can be converted to a vector:
do.call("c",tapply(dat$x1,dat$subject,function(x) cumsum(x)))
So if your data frame is ordered for your subjects:
cbind(your.data.frame,do.call("c",tapply(dat$x1,dat$subject,function(x)
cumsum(x))))
Sounds like a job for the eternally overlookked ave() function:
with(dat, ave(x1, subject, cumsum))
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
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