R help - Nov 2007 - 'Split' character

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

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
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?

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 ?crit :
> 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
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
>