knitr and stopifnot replacement.
On 22/08/2014, 6:02 AM, Bart Kastermans wrote:
I have a daily generated report in which I put a check using stopifnot. Unfortunately I didn?t check the effect very well, turns out that if the condition checked fails this is not shown in the knitr output (I only get an error much later due to a missing object). So my question is, what is the correct way to use assertions in a <filename>.Rnw file. I want to perform a check, and if it fails everything should stop with a message I can generate.
One of the differences between knitr and Sweave is that knitr handles errors, and Sweave doesn't. I expect there's some knitr option to tell it to quit in case of error (a hook?), but you'll have to check the documentation to find it. Duncan Murdoch