[R] lists and rownames

jim holtman jholtman at gmail.com
Mon Apr 18 23:44:34 CEST 2016

```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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