[R] lists and rownames

[jim holtman]

You can always add those names to the list:  is this what you are after?

> example.names <- c("con1-1-masked-bottom-green.tsv",
"con1-1-masked-bottom-red.tsv"
+         , "con1-1-masked-top-green.tsv",    "con1-1-masked-top-red.tsv")
> example.list <- strsplit(example.names, "-")
> names(example.list) <- example.names
> example.df <- as.data.frame(example.list)
>
> example.df
  con1.1.masked.bottom.green.tsv con1.1.masked.bottom.red.tsv
con1.1.masked.top.green.tsv
1                           con1                         con1
         con1
2                              1                            1
            1
3                         masked                       masked
       masked
4                         bottom                       bottom
          top
5                      green.tsv                      red.tsv
    green.tsv
  con1.1.masked.top.red.tsv
1                      con1
2                         1
3                    masked
4                       top
5                   red.tsv
> str(example.df)
'data.frame':   5 obs. of  4 variables:
 $ con1.1.masked.bottom.green.tsv: Factor w/ 5 levels
"1","bottom","con1",..: 3 1 5 2 4
 $ con1.1.masked.bottom.red.tsv  : Factor w/ 5 levels
"1","bottom","con1",..: 3 1 4 2 5
 $ con1.1.masked.top.green.tsv   : Factor w/ 5 levels
"1","con1","green.tsv",..: 2 1 4 5 3
 $ con1.1.masked.top.red.tsv     : Factor w/ 5 levels
"1","con1","masked",..: 2 1 3 5 4



Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.

On Mon, Apr 18, 2016 at 4:21 PM, Ed Siefker <ebs15242 at gmail.com> wrote:

> I'm doing some string manipulation on a vector of file names, and noticed
> something curious.  When I strsplit the vector, I get a list of
> character vectors.
> The list is numbered, as lists are.  When I cast that list as a data
> frame with 'as.data.frame()', the resulting columns have names derived
> from the original filenames.
>
> Example code is below.  My question is, where are these names stored
> in the list?  Are there methods that can access this from the list?
> Is there a way to preserve them verbatim?  Thanks
> -Ed
>
> > example.names
> [1] "con1-1-masked-bottom-green.tsv" "con1-1-masked-bottom-red.tsv"
> [3] "con1-1-masked-top-green.tsv"    "con1-1-masked-top-red.tsv"
> > example.list <- strsplit(example.names, "-")
> > example.list
> [[1]]
> [1] "con1"      "1"         "masked"    "bottom"    "green.tsv"
>
> [[2]]
> [1] "con1"    "1"       "masked"  "bottom"  "red.tsv"
>
> [[3]]
> [1] "con1"      "1"         "masked"    "top"       "green.tsv"
>
> [[4]]
> [1] "con1"    "1"       "masked"  "top"     "red.tsv"
>
> > example.df <- as.data.frame(example.list)
> > example.df
>   c..con1....1....masked....bottom....green.tsv..
> 1                                            con1
> 2                                               1
> 3                                          masked
> 4                                          bottom
> 5                                       green.tsv
>   c..con1....1....masked....bottom....red.tsv..
> 1                                          con1
> 2                                             1
> 3                                        masked
> 4                                        bottom
> 5                                       red.tsv
>   c..con1....1....masked....top....green.tsv..
> 1                                         con1
> 2                                            1
> 3                                       masked
> 4                                          top
> 5                                    green.tsv
>   c..con1....1....masked....top....red.tsv..
> 1                                       con1
> 2                                          1
> 3                                     masked
> 4                                        top
> 5                                    red.tsv
>
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