[R] Help deeded: Does a R graphical function return something special?
hhu at ufl.edu
Fri Oct 19 22:40:12 CEST 2007
When I tried to catch a returned value from a R graphical
function or command (e.g., plot, lines, points, abline, title,
xyplot, etc.), I always get a NULL value if it is executed
correctly. For example:
x <- c(1,2,3,4,5,9,13,19,36)
plot.Comm <- plot(x) # plot.Comm <- try(eval(plot(x)))
then plot.Comm has a NULL value. Obviously, this is not a good way
to check if or not it is a graphical function or command since
plot.Comm <- NULL also lets plot.Comm be NULL.
Does anyone knows:
(1) that a R graphical function or command (e.g., plot, lines,
points, abline, title, xyplot, etc.) could return something
special if it is run correctly, which is different from those
returned from executing any R non-graphical functions or
(2) that there is an easy way for a R programmer to know that a R
function or command is a graphical one before executing it?
Thank you very much for the help in advance.
Have a good weekend!
More information about the R-help