Scale_size_manual()

scale_size_manual continuous
scale_fill_manual
scale_size_manual not working
scale_fill_discrete palettescale_fill_discrete change color
scale_color_manual
scale_size_manual example
scale_alpha_manual

scale_size_manual() : to change the size of points. # Change colors and shapes manually ggplot(df, aes(x=wt, y=mpg, group=cyl)) + geom_point( I think you need to add size as an aethetic. Try aes(x=rates, y=sizes, group=names, size=names) and you'll see scale_size_manual() kick in. 0.5, 0.5))+ scale_size_manual(values=c(1,0.5,0.5,0.5)) bob2=ggplot(bob,aes(y=fd,x=mb,color=pops,alpha=pops,size=pops))+ geom_line()+The functions scale_colour_manual() , scale_fill_manual() , scale_size_manual() , etc. work on the aesthetics specified in the scale name: colour , fill , size The functions `scale_colour_manual()`, `scale_fill_manual()`, `scale_size_manual()`,. #' etc. work on the aesthetics specified in the scale name: `colour`, The confusion is in what manually means - there's no point in doing + scale_linetype(). I've improved that line for the next version. size=factor(cyl)) # To control the size mapping for discrete variable, use # scale_size_manual: last_plot() + scale_size_manual(values=c(2,4,6)). The functions scale_colour_manual() , scale_fill_manual() , scale_size_manual() , etc. work on the aesthetics specified in the scale name: colour , fill , size