change the color for bars in geom bar in ggplot

+1 vote
Hi, my problem is i want to fill bars in differnt colors, but if i use color or fill it gives blue scale in bars. How to provide different colors or default colors for each bar?
Jul 23, 2019 in Data Analytics by radha
30,097 views

2 answers to this question.

+1 vote

Hi @radha,

You can have 2 types of a bar chart in ggplot ( Continuos or discrete )

For Continuous, You have 2 types of color scales, default and Viridis.

ggplot(mpg, aes(displ, hwy, fill = displ)) + geom_bar(stat = "identity")
ggplot(mpg, aes(displ, hwy, fill = displ)) + geom_bar(stat = "identity") + scale_fill_continuous(type = "viridis")

You can see below colors,

  

     

For discrete bars, you can provide colors or default colors by R.

You can change the palette using scale_colour_brewer(palette = "Set1,2, ... ") to chnage the colors.

Alternative using scale_fill_manual(values = c("red","blue","green","yellow"))

answered Jul 24, 2019 by Cherukuri
• 33,010 points
0 votes

Hi,

You can use the geom_bar() function to change the colors of bars as shown below.

df <- data.frame(dose=c("D0.5", "D1", "D2"), len=c(4.2, 10, 29.5)) 
head(df)
library(ggplot2) 
# Basic barplot 
p<-ggplot(data=df, aes(x=dose, y=len)) + geom_bar(stat="identity")
answered Dec 15, 2020 by MD
• 95,340 points

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