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rggplot2
Ludo
Ludo

Reputation: 281

ggplot: line with different widths

With ggplot2, it is really easy to plot a line with two colours, based on the value of the "col" variable, but is it possible to plot a line with the left part with one width and the right part with another one ?

Upvotes: 1

Views: 1787

Answers (1)

Didzis Elferts
Didzis Elferts

Reputation: 98449

You get different width for the lines if you use the size= argument inside the aes() and set it to variable that divides your data.

The look of the plot will depend on variable that divides your data in groups.

If the variable is factors then you will get gap between parts of lines.

df1<-data.frame(x=1:10,y=1:10,z=rep(c("a","b"),each=5))
ggplot(df1,aes(x,y,size=z))+geom_line()

enter image description here

If the variable is numeric then there will be no gap.

df2<-data.frame(x=1:10,y=1:10,z=c(1,1,1,2,2,2,3,3,4,4))
ggplot(df2,aes(x,y,size=z))+geom_line()

enter image description here

Upvotes: 1

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