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?
Please help, Thanks!
Your frustrated
Andrew
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