Dear group,
I have recognized a strange behaviour of palette(). I tried to find any
explanation but failed so far (or even didnt understood the idea behind
- what is most probable).
My original plan was to define a palette, save it in a variable and use
it later for an image-plot. One reason why I tried to store the palette
in a variable was, because I wanted to change individual values (e.g.
the first value to gray).
Interestingly, the palette is not defined correctly in the first run,
but in the second run.
Simple example:
>rm(list=ls())
> a <- palette(rainbow(6))
> a
[1] "red" "#FF4C00" "#FF9900" "#FFE500" "#CCFF00" "#80FF00"
"#33FF00" "#00FF19" "#00FF66" "#00FFB2" "cyan" "#00B3FF" "#0066FF"
"#0019FF" "#3300FF" "#8000FF" "#CC00FF"
[18] "#FF00E6" "#FF0099" "#FF004D"
> a <- palette(rainbow(6))
> a
[1] "red" "yellow" "green" "cyan" "blue" "magenta"
###################
Interestingly, this works at the first time
> palette(rainbow(20)) # six color rainbow
> plot(rnorm(20),col=1:20)
as well as
> palette(rainbow(6))
> a <- palette()
> a
[1] "red" "yellow" "green" "cyan" "blue" "magenta"
So, it seems to be that first a palette has to be defined (or set as to
be used) and then the vector can be assigned to a variable. I dont
understand why.
Thank you in advance for your help and explanation.
Daniel
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