Paste in column names into dplyr::mutate
<p>Using dplyr it's easy to create a new column as a function of other columns</p>

<pre><code>library(dplyr)
mutate(iris, Sepal.Length + Sepal.Width)
</code></pre>

<p>Unfortunately, I have a situation where I need to paste these column names into mutate. I've tried unquoting the strings but that does not work:</p>

<pre><code>mutate(iris, print("Sepal.Length",quote=FALSE) + print("Sepal.Width",quote=FALSE))  
</code></pre>

<p>Any suggestions would be greatly appreciated.    </p>