My character array is the following:
**Note: the array was changed. Sorry, my mistake**

```
m <- c("VI-2005","III-2005","II-2005","I-2005","III-2006","II-2006","I-2006","VI-2006","IV-2007","III-2007","II-2007","I-2007")

```

I have roman numbers and years.
I would like to sort it in descending order so that I will have an output like this:

```
I-2005
II-2005
III-2005
IV-2005
I-2006
II-2006
III-2006
IV-2006
I-2007
II-2007
III-2007
IV-2007

```

I had try the `mixedsort` from the "gtools" package:

```
> # install.packages("gtools") ## Uncomment if not already installed
> library(gtools)
> mixedsort(m)

```

But it doesn't sort by the roman numbers.
Thank you for reading!