Create set of colors, interpolating through a set of preferred colors.
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integer determining number of colors to be generated
darkColors is based on the Dark2 palette in RColorBrewer, therefore
useful to describe qualitative features of the data.
seqColors is based on Blues and generates a gradient of blues, therefore
useful to describe quantitative features of the data.
behaves similarly, but it is based on OrRd (white-orange-red).
divColors is based on the RdBu pallete in RColorBrewer, therefore
useful to describe quantitative features ranging on two extremes.
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x <- 1:10 y <- 1:10 cols1 <- darkColors(10) cols2 <- seqColors(10) cols3 <- divColors(10) cols4 <- seqColors2(10) plot(x, y, col=cols1, xlim=c(1, 13), pch=19, cex=3) points(x+1, y, col=cols2, pch=19, cex=3) points(x+2, y, col=cols3, pch=19, cex=3) points(x+3, y, col=cols4, pch=19, cex=3) abline(0, 1, lty=2) abline(-1, 1, lty=2) abline(-2, 1, lty=2) abline(-3, 1, lty=2)
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