I tried googling for "start icon" and "stop icon" and, amongst other things, I saw as below. Now, R does not have a triangle pointing to the right, but a triangle pointing up seems fine. As for an octagon, R doesn't have that, but it does have a diamond (pch=23), which is visually (to me) similar.
Based on this, I think pch=2 should mean start, and pch=23 should mean end. @j-harbin, if you agree, perhaps change (and document).
I tried googling for "start icon" and "stop icon" and, amongst other things, I saw as below. Now, R does not have a triangle pointing to the right, but a triangle pointing up seems fine. As for an octagon, R doesn't have that, but it does have a diamond (
pch=23
), which is visually (to me) similar.Based on this, I think
pch=2
should mean start, andpch=23
should mean end. @j-harbin, if you agree, perhaps change (and document).start
end (or stop)