I have a vector with `rownames`, so it can be considered a "matrix" with 2 columns (one for filename, one for `Topic`):

```
> res
                   Topic
jardine-1.docx.md      1
jardine-2.docx.md      1
jardine-a1.docx.md     1
jardine-a2.docx.md     1
jardine-a3.docx.md     1
jardine-a4.docx.md     3
jardine-a5.docx.md     1
jardine-a6.docx.md     3
jardine-a7.docx.md     3
jardine-a8.docx.md     1
...

```

These are results from the awesome R package on topic modelling, aptly called `topicmodels`.

I want to `cast` this "vector" into *wide* format, just for presentation purposes.

This of courses break "tidy data" principles, where "each observation, or case, is in its own row" (see *Data Transformation with `dplyr`*, available [here](https://www.rstudio.com/resources/cheatsheets/).) Nevertheless, the wide format is much neater than the long format:

```
              Topic1       Topic2             Topic3
1  jardine-1.docx.md jk-1.docx.md jardine-a4.docx.md
2  jardine-2.docx.md jk-2.docx.md jardine-a6.docx.md
3 jardine-a1.docx.md jk-4.docx.md jardine-a7.docx.md
4 jardine-a2.docx.md jk-5.docx.md  singtel-1.docx.md
5 jardine-a3.docx.md jk-6.docx.md  singtel-2.docx.md
6 jardine-a5.docx.md         <NA>  singtel-3.docx.md
7 jardine-a8.docx.md         <NA>  singtel-4.docx.md
8       jk-3.docx.md         <NA>  singtel-5.docx.md
9       jk-7.docx.md         <NA>               <NA>

```

This of course can be done in a variety of ways - one of which looks like this (**warning: ugly**)

```
# via cbind
T1=rownames(subset(res, Topic==1))
T2=rownames(subset(res, Topic==2))
T3=rownames(subset(res, Topic==3))
n=max(length(T1),length(T2),length(T3))
length(T1) <- n
length(T2) <- n
length(T3) <- n
cbind(T1,T2,T3)

```

**My question:**

Are there any other better ways of presenting this, considering that all code will be within a R Markdown file for presentation purposes?