It seems to me that the reshape package should do the job,
library(reshape) # note that you need to fix the method to melt lists
in the current version ( passing ... to the method for data.frames, as
discussed here last week)
cast(data=melt(dat), fun.aggregate = function(.x) rle(.x)$length[1])
this works for me, but I have to confess a very limited understanding
of reshape.
Hope this helps,
baptiste
On 2 Aug 2008, at 10:07, [EMAIL PROTECTED] wrote:
Hello everybody,
I have problem with a lapply command, which rather proves that I don't
fully understand it.
I want to extract from a list that consists of dataframes, the length
of the first sequences from a given variable (its part of a simulation
exercises).
Below is code which does the job, but I think it should be possible to
make it more compact.
### Example Data
dat <-list()
dat[[1]] <- data.frame(matrix( rbinom(40, 1, .8),nrow=5))
dat[[2]] <- data.frame(matrix( rbinom(40, 1, .8),nrow=5))
####Code
x<-sapply(dat,"[",3) #Extracting the vector
y<-lapply(x,rle) #Counting the sequences which is returned
as a list
z<-sapply(y,"[", 1) #extracting the first element of the list of
sequence counts
final<-sapply(z,"[",1) #extracting the first number, which gives the
length of the first sequence, which I want
final
###############
Thanks for your help,
Stefan
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_____________________________
Baptiste Auguié
School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK
Phone: +44 1392 264187
http://newton.ex.ac.uk/research/emag
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
