A list of coordinates. Note that if you don't put the result in a
variable, it returns as the command text for generating the list. This can
be useful to get coordinates by mouse-clicking once, but then using the code
for convenience and reproducibility.
Arguments
nb
Number of positions.
digits
2 integer indicating the number of decimal places
(respectively for x and y coordinates).
if (FALSE) {
plot(runif(20, max = 5000))
# note the negative number for the rounding of $ycoord <- pasteLoc(3, digits = c(2, -1))
text(coord, c("a", "b", "c"))
}