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.

Answer 1

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"))