Full_Name: Barry Rowlingson Version: 2.2.0 OS: Linux Submission from: (NULL) (194.80.32.8)
The image function with a matrix of all NA values fails with: > xyz=list(x=1:3,y=1:4,z=matrix(NA,3,4)) > image(xyz) Error in image.default(xyz) : invalid z limits In addition: Warning messages: 1: no finite arguments to min; returning Inf 2: no finite arguments to max; returning -Inf Image can handle any number of NAs as long as there is at least one data value: > xyz=list(x=1:3,y=1:4,z=matrix(c(1,rep(NA,11)),3,4)) > image(xyz) and shows NAs as transparent. However if it is all NAs then the z-limit calculation breaks down as above. It seems reasonable to me that image() with all NAs should produce a completely transparent/empty image (after displaying the axes if add!=TRUE) and not fail with an error. Barry ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
