knitr: How to prevent text wrapping in output?

Question

I am having a problem with text wrapping in code output chunks in knitr when knitting to HTML.

For example, if I run the following:

matrix(rnorm(60, 5, 2), ncol = 12) 

The output in HTML will wrap the table, giving an output like this, where the 12th column is moved underneath the rest:

##       [,1]   [,2]  [,3]  [,4]  [,5]  [,6]  [,7]  [,8]  [,9] [,10] [,11] ## [1,] 3.407 0.8035 2.981 5.269 6.989 5.107 7.143 3.127 3.624 7.220 4.805 ## [2,] 3.907 5.5971 5.488 4.995 6.496 5.980 1.576 3.009 6.605 3.440 2.754 ## [3,] 1.945 3.7668 4.860 2.945 3.663 5.945 7.168 2.012 5.873 8.190 7.441 ## [4,] 4.893 6.2054 4.403 3.967 2.880 7.196 1.813 3.283 5.216 5.699 2.829 ## [5,] 5.706 0.9084 5.802 1.404 3.122 1.866 6.613 3.299 4.990 3.645 3.766 ##       [,12] ## [1,] 0.3951 ## [2,] 4.0866 ## [3,] 5.9293 ## [4,] 6.4729 ## [5,] 2.7172 

Is there a method to adjust the width of the output chunk, so that I can have a table where the rows appear all on one line, like so?

##       [,1]   [,2]  [,3]  [,4]  [,5]  [,6]  [,7]  [,8]  [,9] [,10] [,11] [,12] ## [1,] 3.407 0.8035 2.981 5.269 6.989 5.107 7.143 3.127 3.624 7.220 4.805 0.3951 ## [2,] 3.907 5.5971 5.488 4.995 6.496 5.980 1.576 3.009 6.605 3.440 2.754 4.0866 ## [3,] 1.945 3.7668 4.860 2.945 3.663 5.945 7.168 2.012 5.873 8.190 7.441 5.9293 ## [4,] 4.893 6.2054 4.403 3.967 2.880 7.196 1.813 3.283 5.216 5.699 2.829 6.4729 ## [5,] 5.706 0.9084 5.802 1.404 3.122 1.866 6.613 3.299 4.990 3.645 3.766 2.7172 

Thanks!

Answer 1

Adding something like options(width=120) to your document would allow you to override the default wrapping width.

Be careful about going too wide though; when converting to PDF or other formats, the default is pretty much just right!

As an example, I use Knitr from RStudio, and type my document as a R markdown document. My document "options" at the start might be something like this:

```{r set-options, echo=FALSE, cache=FALSE} options(width=80) opts_chunk$set(comment = "", warning = FALSE, message = FALSE, echo = TRUE, tidy = TRUE, size="small") read_chunk("some/script/I/want/to/load.R") ```