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