Remove space between bars ggplot2

Question

This is my code

    ggplot(df, aes(x=timepoint, y=mean, fill=group)) +
            geom_bar(position=position_dodge(.3), colour=\"black\", stat=\"identity\",         


        

Answer 1

Just adjust the widths:

ggplot(df, aes(x=timepoint, y=mean, fill=group)) +
  geom_bar(position=position_dodge(0.9), colour="black", stat="identity", width=0.9, , binwidth=0) +
  geom_errorbar(position=position_dodge(0.9), width=0.85, aes(ymin=mean, ymax=mean+sem)) +
  theme_bw()