[R] 'Split' character

[Gabor Grothendieck]

Recall that I had suggested you try interaction in place of paste if
paste was not
what you wanted.

On Nov 26, 2007 3:08 PM, Sébastien <pomchip at free.fr> wrote:
> One additionnal question about a problem that I just noticed in my script:
> the list created by my split function is sorted in the increasing order and
> not in the current order of the elements of the do.call argument (see the
> results of the two last lines of the following script). I was unsuccesful in
> tweaking my split function to have a proper order...
> If there is no way to do that, I guess it comes down to a very basic
> question: how can I reorder a list ?
>
> ####
> how can I reorder the list 'mydata.split' according to
>
> a<-rep(1.5:10.5,each=2)
> b<-rep(21:30,each=2)
> cd<-101:120
> mydata<-data.frame(a,b,cd)
>
> mydata.split <- split(mydata,do.call(paste,c(mydata[,1:2],sep =
> ":")),drop=TRUE)
> names(mydata.split)
> unique(do.call(paste,c(mydata[,1:2],sep = ":")))
>
> ####
>
> Sebastien
>
> Gabor Grothendieck a écrit :
>
> Try this using the BOD data frame that comes with R or
> try using interaction
> in place of paste:
>
> split(BOD, do.call(paste, c(BOD, sep = ":")),
> drop=TRUE)
>
>
> On Nov 25, 2007 10:23 AM, <pomchip at free.fr> wrote:
>
> Thanks Jim and Herinque for you reply.
>
> The substitution you are both
> proposing works fine, except when a or b contains
> decimal numbers (which is
> mostly my case in a real dataset). In this case, there
> is no distinction
> between the decimal point and the one introduced by the split
> function.
> If
> the split function cannot be customized, then I guess I have to
> first
> substitute the decimal point in my dataset by e.g. a * sign and change
> it back
> to a . when the split is done...
>
> Sebastien
>
> jim holtman a écrit :
>
>
> Here is one way:
>
>
> a<-1:10
> b<-21:30
> mydata<-data.frame(a,b)
> mydata.split<-split(mydata,(mydata[,1:2]),drop=TRUE)
> x
> <- mydata.split
> # customize the names
> names(x) <- sapply(strsplit(names(x),
> "\\."), paste, collapse="-my
>
> character-")
>
>
> x
>
> $`1-my character-21`
>  a b
> 1 1 21
>
> $`2-my character-22`
>  a b
> 2 2 22
>
> $`3-my
> character-23`
>  a b
> 3 3 23
> ...........
>
> On Nov 24, 2007 6:15 PM,
> <pomchip at free.fr> wrote:
>
> Dear R-users,
>
> The following code splits a very simple dataframe into a
> list, each element
>
> of
>
>
> the list being one line of the dataframe. You will see that the split
>
> function
>
>
> names each element of the list by using uses the content of a and b and
>
> merging
>
>
> them with a "." character. Is there a way to customize this
> character?
>
> a<-1:10
> b<-21:30
> mydata<-data.frame(a,b)
> mydata.split<-split(mydata,(mydata[,1:2]),drop=TRUE)
> mydata.split
>
> Thanks
> in advance for your
> help.
>
> Sebastien
>
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> minimal, self-contained, reproducible code.
>
>
>
>
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