demo.pal <- function(n, border = if (n < 32) "light gray" else NA,
main = paste("color palettes; n=", n),
ch.col = c("rainbow(n, start=.7, end=.1)", "heat.colors(n)",
"terrain.colors(n)", "topo.colors(n)",
"cm.colors(n)"))
{
nt <- length(ch.col)
i <- 1:n; j <- n / nt; d <- j/6; dy <- 2*d
plot(i, i+d, type = "n", yaxt = "n", ylab = "", main = main)
for (k in 1:nt) {
rect(i-.5, (k-1)*j+ dy, i+.4, k*j,
col = eval(parse(text = ch.col[k])), border = border)
text(2*j, k * j + dy/4, ch.col[k])
}
}
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