# Center image wider than \textwidth

In $\LaTeX$, a figure larger than `\textwidth` may not be well centered: this trick ensures that it is:

```\makebox[\textwidth][c]{%
\includegraphics[width=1.2\textwidth]{mypic.pdf}%
}
```

# EPS figures using the Arial typeface, with R and Ghostscript

I usually use the default font in R and export my figures in `pdf`. Unfortunately, some journals want figures in the EPS format, and do not accept Helvetica (default font in R). Gavin Simpson has an excellent, extremely useful and detailed post on the issue; my post recycles a lot of their tricks.

## Use Arial in the figures generated by R

You first need to download and install the `extrafont` package.

```install.packages('extrafont')
require(extrafont)
```

If it is the first time that you are using the package, you need to install the fonts… and this takes forever. Luckily, you can also choose to only install Arial fonts, and the process is much faster.

```font_import(pattern=&quot;Arial&quot;)
```

If you want to be able to use all the fonts of your system (say if you want to use Comic sans in your R figures), remove the `pattern` argument:

```font_import()
```

but be prepared to wait for a while.

I could not find a way to generate decent eps files directly from R, so I first saved my figures as pdfs. To use Arial in your figures, you just need to change the `family` argument when calling `pdf`:

```pdf(&quot;file.pdf&quot;, family=&quot;Arial&quot;)
dev.off()
```

We are not done yet: the fonts now have to be embedded in the pdf:

```embed_fonts(&quot;file.pdf&quot;)
```

You can specify the name of an `outfile` if you do not want to overwrite the previous pdf.

Note that this step requires Ghostscript, that may not be installed on your machine (it was not on mine)…

## Installing Ghoscript on a Mac

(and realizing that sometimes life was easier with Ubuntu). This was quite a painful process, until I discovered Homebrew, “the missing package manager for OS X”.

First, you need to install Homebrew (instruction taken from the Homebrew homepage):

```ruby -e &quot;\$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)&quot;
```

and then type (as explained there):

```brew install ghostscript
```

Congratulations, now Ghostscript is installed on your machine (make sure you embed the fonts again in R with the `embed_fonts()` function).

## Convert .pdf files to .eps

Last step: convert these `.pdf` figures in the `eps` format. Let’s say that you have generated a bunch of figures with R, stored them in the same folder, and want to convert them all. Open a terminal, go to the folder containing your figures

```cd ~/path/to/your/folder
```

and then type the following two lines. The first line does the `pdf -> ps` conversion, and the second `ps->eps` (for some reason, it’s not possible to go directly from `pdf` to `eps`.)

```for f in *.pdf; do pdf2ps \$f; done
for f in *.ps; do ps2eps \$f; done
```

And that’s it! You should now find in your folder all your figures converted to the EPS format.