Have geom_line() follow the order of appearance in the dataframe not the X axis values.

[Roey Angel]

geom_line() is plotted by default according the order of the data points on the x-axis.
Is there a way to draw geom_line of Y vs X but have the order of connection according to the order in the data frame (or according to another column in the data frame)?

Thanks in advance,
Roey

[Ben Bolker]

Are you looking for geom_path ?

>
> Thanks in advance,
> Roey
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[Ito, Kaori (Groton)]

Dear Roey,

You can use geom_path() . See the example below. I think you need to sort the data if you want the order according to another column in the data frame.

 

#--toy example

d1 <- data.frame(z1=1:10, z2=c(1,10,2,9,3,8,4,6,5,7)

        , x=c(0,2,8,20,16,8,4,2,1,0.5), y=1:10)

 

#--plot is based on the order of x

ggplot(d1, aes(x,y)) + geom_line()

 

#--plot is based on the order of the data (for this case)

ggplot(d1, aes(x,y)) + geom_path()

 

#--change the order of the data by z2

d2 <- d1[order(d1$z2),]

ggplot(d2, aes(x,y)) +  geom_path()

--

[Roey Angel]

Thanks Ben and Kaori,
Totally forgot about geom_path()