Is there any way to use 2 color scales on the same ggplot?

Question

With the data separated by categories (Samples A and B), 2 layers were made, one for points and one for lines. I want to separate my data by category indicating colors for the points and also separate the lines but with different colors than those used for the points.

library(ggplot2) Sample <- c("a", "b") Time <- c(0,1,2) df <- expand.grid(Time=Time, Sample = Sample) df$Value <- c(1,2,3,2,4,6) ggplot(data = df, aes(x = Time, y = Value)) + geom_point(aes(color = Sample)) + geom_line(aes(color = Sample)) + scale_color_manual(values = c("red", "blue")) + #for poits scale_color_manual(values = c("orange", "purple")) #for lines

stefan · Accepted Answer · 2021-06-01 13:18:20Z

Making use of the ggnewscale package this could be achieved like so:

library(ggplot2) library(ggnewscale) Sample <- c("a", "b") Time <- c(0,1,2) df <- expand.grid(Time=Time, Sample = Sample) df$Value <- c(1,2,3,2,4,6) ggplot(data = df, aes(x = Time, y = Value)) + geom_point(aes(color = Sample)) + scale_color_manual(name = "points", values = c("red", "blue")) + #for poits new_scale_color() + geom_line(aes(color = Sample)) + scale_color_manual(name = "lines", values = c("orange", "purple")) #for lines

zx8754 · Accepted Answer · 2021-06-01 13:19:00Z

Using colour columns and scale_color_identity:

df$myCol1 <- rep(c("red", "blue"), each = 3) df$myCol2 <- rep(c("orange", "purple"), each = 3) ggplot(data = df, aes(x = Time, y = Value)) + geom_point(aes(color = myCol1)) + geom_line(aes(color = myCol2)) + scale_color_identity()

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