You saw how to use scale_color_brewer to create various color schemes, starting with a range of blues (the default color scheme). While using this function, you must select the palette you wish to use. The scale_color_brewer() function uses syntax like this:
scale_color_brewer(..., type = , palette = )
You can select either seq (sequential), div (diverging), or qual (qualitative). Within those options, you can then select a particular palette, where the available palettes control color schemes. Further information on scale_color_brewer() can be found at http://docs.ggplot2.org/current/scale_brewer.html.
Try all of the following lines of syntax yourself:
P + geom_point(aes(color = factor(ETH)), size=I(4)) + scale_color_brewer(type="div") P + geom_point(aes(color = factor(ETH)), size=I(4)) + scale_color_brewer(palette="Greens") P + geom_point(aes(color = factor(ETH)), size=I(4)) + scale_color_brewer(type="seq", palette=3) P + geom_point(aes(color = factor(ETH)), size=I(4)) + scale_color_brewer(type="seq", palette=4) P + geom_point(aes(color = factor(ETH)), size=I(4)) + scale_color_brewer(type="seq", palette=6) P + geom_point(aes(color = factor(ETH)), size=I(4)) + scale_color_brewer(type="seq", palette=7) P + geom_point(aes(color = factor(ETH)), size=I(4)) + scale_color_brewer(palette="Reds") P + geom_point(aes(color = factor(ETH)), size=I(4)) + scale_color_brewer(palette="Set1")
You can devise many other combinations of type and palette. Let's see the graph of the last command:
We have mapped attractive colors to each level of ethnicity.