R help - Jul 2009 - regex expression to select row or column

I have a multidimensional data which looks like the following:

        "S1-a" "S2-b" "S3-c" "S4-d"
"S5-a" "S6-b" "S7-c" "S8-d"
"T1-A"
"T1-B"
"T1-C"
"T1-D"
"T2-A"
"T2-B"
"T2-C"
"T2-D"

I read it from csv file and would like to have 16 separate data frames 
like this

      "S1-a" "S2-a"     "S1-b" "S2-b"   
"S1-c" "S2-c"    "S1-d" "S2-d"
"T1-A"            "T1-A"            "T1-A"        
"T1-A"
"T2-A"            "T2-A"            "T2-A"        
"T2-A"

      "S1-b" "S2-b"   ...
"T1-B"               ...
"T1-B"               ...

...
...

One way is to use loops to cycle through, but I think it's even simpler 
to use regex expression to separate them since "abcd" and
"ABCD" are
unique strings in the table. Does anybody have any pointer on how to do 
this?

Thanks
Gordon

It it not entirely clear what the format of your data is. If you have
a dataframe that you would like to separate into several different one
based on the value in a column, then something like this will work:

df.list <- split(yourDF, yourDF$column)

This will create a list of dataframes, split according to the contents
of "column".

On Fri, Jul 24, 2009 at 9:20 PM, Junqian Gordon Xu<xjqian at gmail.com>
wrote:
> I have a multidimensional data which looks like the following:
>
> ? ? ? "S1-a" "S2-b" "S3-c" "S4-d"
"S5-a" "S6-b" "S7-c" "S8-d"
> "T1-A"
> "T1-B"
> "T1-C"
> "T1-D"
> "T2-A"
> "T2-B"
> "T2-C"
> "T2-D"
>
> I read it from csv file and would like to have 16 separate data frames like
> this
>
> ? ? "S1-a" "S2-a" ? ? "S1-b" "S2-b"
? ? "S1-c" "S2-c" ? ?"S1-d" "S2-d"
> "T1-A" ? ? ? ? ? ?"T1-A" ? ? ? ? ? ?"T1-A" ?
? ? ? ? ?"T1-A"
> "T2-A" ? ? ? ? ? ?"T2-A" ? ? ? ? ? ?"T2-A" ?
? ? ? ? ?"T2-A"
>
> ? ? "S1-b" "S2-b" ? ...
> "T1-B" ? ? ? ? ? ? ? ...
> "T1-B" ? ? ? ? ? ? ? ...
>
> ...
> ...
>
> One way is to use loops to cycle through, but I think it's even simpler
to
> use regex expression to separate them since "abcd" and
"ABCD" are unique
> strings in the table. Does anybody have any pointer on how to do this?
>
> Thanks
> Gordon
>
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>


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

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