In the course of producing some plots for a publication, I wanted to mark the places where double counting of cases had occurred. I used three symbols, “*”, “^” and “#”. While these worked fine if the code was pasted into the R console, the “#” (comment character) was recognized even when quoted if the code was read with “source”, causing a silent error. Trying to escape the character didn’t work. This is mainly to alert those who try to use a comment character as a marker that it will work when the code is pasted, but not when the same code is sourced.

Jim

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