I'm looking for an R mentor. I want to propose a change in management
of plot options xlim and ylim.
Did you ever want to change one coordinate in xlim or ylim? It happens
to me all the time.
x <- rnorm(100, m=5, s=1)
y <- rnorm(100, m=6, s=1)
plot(x,y)
## Oh, I want the "y axis" to show above x=0.
plot(x,y, xlim=c(0, ))
##Output: Error in c(0, ) : argument 2 is empty
plot(x,y, xlim=c(0,NA ))
## Output: Error in plot.window(...) : need finite 'xlim' values
I wish that plot would let me supply just the min (or max) and then
calculate the other value where needed.
It is a little bit tedious for the user to do that for herself. The
user must be knowledgeable enough to know where the maximum (MAX) is
supposed to be, and then supply xlim=c(0, MAX). I can't see any reason
for insisting users have that deeper understanding of how R calculates
ranges for plots.
Suppose the user is allowed to supply NA to signal R should fill in the blanks.
plot(x,y, xlim=c(0, NA))
In plot.default now, I find this code to manage xlim
xlim <- if (is.null(xlim))
range(xy$x[is.finite(xy$x)])
And I would change it to be something like
##get default range
nxlim <- range(xy$x[is.finite(xy$x)])
## if xlim is NULL, so same as current
xlim <- if (is.null(xlim)) nxlim
## Otherwise, replace NAs in xlim with values from nxlim
else xlim[ is.na(xlim) ] <- nxlim[ is.na(xlim) ]
Who is the responsible party for plot.default. How about it?
Think of how much happier users would be!
pj
--
Paul E. Johnson
Professor, Political Science Assoc. Director
1541 Lilac Lane, Room 504 Center for Research Methods
University of Kansas University of Kansas
http://pj.freefaculty.org http://quant.ku.edu
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