Hello, I'm trying to set different boxes to different colors the following page shows http://www.sthda.com/english/wiki/ggplot2-box-plot-quick-start-guide-r-software-and-data-visualization I've tried the code ToothGrowth$dose <- as.factor(ToothGrowth$dose) head(ToothGrowth) library(ggplot2) # Basic box plot p <- ggplot(ToothGrowth, aes(x=dose, y=len)) + geom_boxplot() p+scale_color_manual(values=c("#999999", "#E69F00", "#56B4E9")) p But still can not get the colors to show up. I'm sure it is something simple I'm doing wrong and would appreciate help. Thank you in advance David
Colors on box plots in ggplot
3 messages · David Doyle, Jeff Newmiller, S Ellison
I see you creating a variable p, evaluating and printing a modified version of that variable, and then printing that variable (presumably overwriting the first plot). Are you executing your code one line at a time when troubleshooting?
On January 17, 2019 2:32:51 PM PST, David Doyle <kydaviddoyle at gmail.com> wrote:
Hello, I'm trying to set different boxes to different colors the following page shows http://www.sthda.com/english/wiki/ggplot2-box-plot-quick-start-guide-r-software-and-data-visualization I've tried the code ToothGrowth$dose <- as.factor(ToothGrowth$dose) head(ToothGrowth) library(ggplot2) # Basic box plot p <- ggplot(ToothGrowth, aes(x=dose, y=len)) + geom_boxplot() p+scale_color_manual(values=c("#999999", "#E69F00", "#56B4E9")) p But still can not get the colors to show up. I'm sure it is something simple I'm doing wrong and would appreciate help. Thank you in advance David [[alternative HTML version deleted]]
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-----Original Message----- From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of David I'm trying to set different boxes to different colors the following page shows
http://www.sthda.com/english/wiki/ggplot2-box-plot-quick-start-guide-r- software-and-data-visualization I've tried the code ToothGrowth$dose <- as.factor(ToothGrowth$dose) head(ToothGrowth) library(ggplot2) # Basic box plot p <- ggplot(ToothGrowth, aes(x=dose, y=len)) + geom_boxplot() p+scale_color_manual(values=c("#999999", "#E69F00", "#56B4E9")) p
You have not mapped an aesthetic to colour, so the scale (which applies to an aesthetic) is not being used at all.
Try
( p <- ggplot(ToothGrowth, aes(x=dose, y=len)) + geom_boxplot(aes(colour=dose)) )
which uses default colours. Once you have an aes mapping you can change the scale, so
( p + scale_colour_manual(values = c("red", "blue", "green")) )
gives you the colour ordering you want.
( p + scale_colour_manual(values = c("red", "blue", "green"), guide=FALSE) )
also removes the redundant colour key.
S Ellison
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