Change size of a line plot, understand how the size argument works

Question

I\'m making a multiple lines plot with errorbars. If I don\'t use the size argument, everything is fine:

# sample data
Response=runif(4)
ResponseMin         


        

Answer 1

If you set size inside aes you are mapping it to a variable

`1` = 1

and ggplot2 creates a legend. If you just want to set the size, you can do that outside of aes:

geom_line(aes(group=Case), size = 1)

Answer 2

try this, size outside aes()

ggplot(df,aes(x=x,y=Average,colour=Case)) +
    geom_line(aes(group=Case), size = 1) + 
    geom_point() +
    geom_errorbar(aes(ymin=Lower,ymax=Upper,width=0.25)) +
    labs(y="foo",title="Some plot fu")