Change bar plot colour in geom_bar with ggplot2 in r

Question

I have the following in order to bar plot the data frame.

c1 <- c(10, 20, 40)
c2 <- c(3, 5, 7)
c3 <- c(1, 1, 1)
df <- data.frame(c1, c2, c3)
ggplot(data=df, aes(x=c1+c2/2, y=c3)) +
  geom_bar(stat="identity", width=c2) +
  scale_fill_manual(values=c("#FF6666"))

I end up having only grey bars: Grey bars for bar plot

I would like to change the color of the bar. I already tried different scale_fill_manual from http://www.cookbook-r.com/Graphs/Colors_(ggplot2)/ but still have grey bars.

Thank you for your help.

If you only want to change the general colors of bars, without differences between bars, write it directly in geom_bar(): geom_bar(stat="identity", width=c2, color = "#FF6666") — bVa
So this time I only have the contour of color="#FF6666", the filling stays grey. Now if I put : ggplot(data=df, aes(x=c1+c2/2, y=c3, fill=c3)) + geom_bar(stat="identity", width=c2) I then have a blue-ish color filled, but again, I do not get to choose manually. — tuttifolies
geom_bar(stat="identity", width=c2, fill = "#FF6666") for same fill for all the bars. Use scale_fill_manual(values=c("#FF6666")) if you want to set color by a variable (category). — bVa
do you get a red color? Because what you just wrote is what I have put in my question and I still get grey. I also tried ggplot(data=df, aes(x=c1+c2/2, y=c3, fill=c3)) + geom_bar(stat="identity", width=c2) + scale_fill_manual(values=c("#FF6666")) but this gives me the error Error : Continuous value supplied to discrete scale — tuttifolies
I have a red color using ggplot(data=df, aes(x=c1+c2/2, y=c3)) + geom_bar(stat="identity", width=c2, fill = "#FF6666") which is similar to ggplot(data=df, aes(x=c1+c2/2, y=c3)) + geom_bar(stat="identity", width=c2, fill = "red") — bVa

bVa bVa · Accepted Answer · 2016-08-05T12:00:47

If you want all the bars to get the same color (fill), you can easily add it inside geom_bar.

ggplot(data=df, aes(x=c1+c2/2, y=c3)) + 
geom_bar(stat="identity", width=c2, fill = "#FF6666")

Add fill = the_name_of_your_var inside aes to change the colors depending of the variable :

c4 = c("A", "B", "C")
df = cbind(df, c4)
ggplot(data=df, aes(x=c1+c2/2, y=c3, fill = c4)) + 
geom_bar(stat="identity", width=c2)

Use scale_fill_manual() if you want to manually the change of colors.

ggplot(data=df, aes(x=c1+c2/2, y=c3, fill = c4)) + 
geom_bar(stat="identity", width=c2) + 
scale_fill_manual("legend", values = c("A" = "black", "B" = "orange", "C" = "blue"))

Change bar plot colour in geom_bar with ggplot2 in r

1 Answers