Suppressing Error Messages in knitr

Question

I wonder how to suppress error messages in knitr. My MWE is below:

\\documentclass{article} 
\\begin{document}
<< Test >>=
1:10
X
@          


        

Answer 1

Errors have their own dedicated hook function, stored in the environment accessed by knit_hooks$get(). Here, for your enlightenment, is the complete list of those functions:

names(knit_hooks$get())
# [1] "source"   "output"   "warning"  "message"  "error"    "plot"    
# [7] "inline"   "chunk"    "document"

To suppress warnings, just overwrite the default error hook function with one that takes the required arguments, but doesn't return anything at all.

\documentclass{article}
\begin{document}

<<setup, include=FALSE, cache=FALSE>>=
muffleError <- function(x,options) {}
knit_hooks$set(error=muffleError)
@

<<Test>>=
1:10
X
@
\end{document}

Which, upon compilation, yields the following