[R] Control of x-axis variable ordering in ggplot

[Jeff Newmiller]

The ggplot function has no display behaviour. You have to couple it with a geom function to define how the data will be displayed. Read ?geom_line and ?geom_poly.
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Sent from my phone. Please excuse my brevity.

On October 23, 2015 3:46:02 AM GMT+02:00, sbihorel <Sebastien.Bihorel at cognigencorp.com> wrote:
>Hi,
>
>Given a certain data.frame, the lattice xyplot function will plot the 
>data as.is and join the data point in the order of the data frame. It
>is 
>my (probably flawed) understanding that, using the same data frame, 
>ggplot orders the data by increasing order of the x-axis variable. Can 
>one control this behavior?
>
>Thanks
>
>Sebastien
>
>Code example
>
>library(lattice)
>library(ggplot2)
>
>
>data <- data.frame(x=rep(1:4,each=25),
>                    y=rep(1:25,times=4),
>                    g=rep(1:4,each=25))
>data$x <- data$x + 0.005*(data$y)^2-0.1*data$y+1
>
>col <- 3:7
>
>xyplot(y~x,data=data,groups=g,type='l',col=col)
>
>ggplot(data, aes(x,y,group=g)) + geom_point(colour=col[data$g]) +
>   geom_line(colour=col[data$g])
>
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