Increase space between bars in ggplot

Question

I have a bar plot:

p <- ggplot(data=df, aes(x=Gene, y=FC, fill=expt, group=expt))
p <- p + geom_bar(colour=\"black\", stat=\"identity\", position = pos         


        

Answer 1

You can adjust the width outside of the position_dodge as well (in geom_bar),

ggplot(data=df, aes(x=Gene, y=FC, fill=expt, group=expt)) +
  geom_bar(colour="black", stat="identity", position = position_dodge(width = 0.8), width=0.5) +
  geom_errorbar(aes(ymax = FC + se, ymin = FC, group=expt),
                position = position_dodge(width = 0.8), width = 0.25)

or

dodge <- position_dodge(width = 0.5)

ggplot(data=df, aes(x=Gene, y=FC, fill=expt, group=expt)) +
  geom_bar(colour="black", stat="identity", position=dodge, width=0.5) +
  geom_errorbar(aes(ymax = FC + se, ymin = FC, group=expt),
                position = dodge, width = 0.25)