Hi Greg and all the others,
thanks for your answer. The color-vector has the same length like the at-vector
but the recycling cannot be the reason, because only values slightly above my
"threshold" doe not appear blue.
I cannot find a good explanation of which colors are assigned to which value
ranges.
I've made little example:
#--------------------------------------------------------
mat <- matrix(seq(1,5, length.out = 12), nrow = 3)
mat[1,2] <- 3.5
my.at <- seq(0.5,5.5)
my.col.regions <- rainbow(6)
graph <- levelplot(t(mat[nrow(mat):1, ] ), at = my.at, col.regions =
my.col.regions)
print(graph)
windows()
plot(1:10)
legend("topleft", legend = as.character(my.col.regions), col = my.col.regions,
pch = 18)
#--------------------------------------------------------
As you can see the green (position 3 in my.col.regions) disappears completely
in the levelplot (look at the color range at the right side!).
I guess it might also happen in my case...
I've tested several cases and it looks like the length of the color-vector
should be one less than the at vector (which would make sense).
Then, the rule might apply:
[ at[1],at[2] ] = color[1]
( at[2],at[3] ] = color[2]
...
( at[n-1],at[n] ] = color[n-1]
Please correct me if I'm wrong!!!
Antje
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