Looks like the function rainbow has a bug in it.
> rainbow(8)
[1] "#FF0000" "#FFBF00" "#7FFF00"
"#00FF3F" "#00FFFF" "#003FFF" "#7F00FF"
[8] "#FF00BF"
> rainbow(10)
[1] "#FF0000" "#FF9900" "#CBFF00"
"#32FF00" "#00FF66" "#00FFFF" "#0065FF"
[8] "#3300FF" "#CC00FF" "#FF0098"
> rainbow(11)
[1] "#FF0000" "#FF8B00" "#E7FF00"
"#5CFF00" "#00FF2E" "#00FFB9" "#00B9FF"
[8] "#002EFF" "#5C00FF" "#E700FF"
"#FF008B"
> rainbow(12)
Error: invalid color intensity
> rainbow(15)
Error: invalid color intensity
E. S. Venkatraman
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