Hi
imagine the following situation:
a <- runif(100)
plot(a[a>0.5])
plots only the elements in the vector which are larger then 0.5
Now imagine a matrix:
b <- matrix(runif(20000), ncol=40, nrow=50)
image(b[b>0.5])
Error in image.default(b[b > 0.5]) : argument must be matrix-like
Is there a similar way then above to plot an image from the matrix with only
the elements larger then 0.5, and the remaining elements equals NA?
I know I could do something like
image(b, zlim=c(0.5, 1))
but this includes 0.5 in the image,
bb <- b
bb[bb<=0.5] <- NA
image(bb)
but this includes an additional assignment.
This is not of practical use at the moment - the question came up when
preparing a lecture.
Rainer
--
Rainer M. Krug, Centre of Excellence for Invasion Biology, Stellenbosch
University, South Africa
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