[R] image NAs error

[Christoph Lehmann]

tmp.vimp <- matrix(NA, nrow = x.dim, ncol = y.dim)
tmp.vimp <- image(tmp.vimp, col=rainbow)

gives:

Error in image.default(tmp.vimp, col = rainbow) :
         invalid z limits
In addition: Warning messages:
1: no finite arguments to min; returning Inf
2: no finite arguments to max; returning -Inf


even though NAs are allowed in image

what went wrong here?

thank you

Christoph