Further to Uwe's answer: I suspect that you're not telling us
the whole story (that's why it's so useful to have reproducible
code).
Try this:
x <- y <- 1:3
z <- outer(x, y)
z[1,1] <- 1/0
persp(x,y,z)
which results in:
Error in persp.default(x, y, z) : invalid 'z' limits
So, are some your 'NaN's actually 'Inf's?
-Peter Ehlers
Uwe Ligges wrote:
On 07.02.2010 22:46, Andrew Wang wrote:
I have this data set that both x& y are ordered vectors of length
600& 700 respectively; z is a 600 by 700 matrix whose entry z[i,j] is
either a missing value (indicated by 'NaN') or a real number between 0
and 1. The contour function
contour(x,y,z)
gives me a blank picture. I guess the reason is that most of z-entries
are missing, only less than 1% are non missing.
Question (1)
Is there a way that I could manipulate the data or function to have
the non-missing values plotted?
Also, trying function "persp" gives me this error message
persp(x,y,z)
Error in persp.default(x, y, z) : invalid 'z' limits
I look at the manual of "persp". I guess, the error message comes from
its internal call
zlim = range(z, na.rm = TRUE)
it appears to me that "persp" can't handle missing value yet its
manual states clearly
z: a matrix containing the values to be plotted ('NA's are
allowed). Note that ‘x’ can be used instead of ‘z’
for convenience.
Question (2)
Can "persp" handle missing values in z? if the answer is a sounding
"yes", how should I do in my case?
Works for me:
persp(1:2, 1:2, matrix(c(1:3, NA), nrow=2))
Hence you really need to specify an example where it does not work.... -
as the posting guide asks you to do anyway.
Uwe Ligges
Please help, Thanks!
Your frustrated
Andrew
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Peter Ehlers
University of Calgary
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
