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

[c06n]

Hi,

are you trying to do the same thing with ggplot as with lattice? 

In this case, your solution looks probably like this: 

ggplot(data, aes(x, y, group = g)) + 
  geom_path(aes(colour = g))

If you haven’t done so yet, I strongly recommend reading through the ggplot2 documentation: http://docs.ggplot2.org/current/index.html <http://docs.ggplot2.org/current/index.html>

It’s a bit of a read, but you’ll need this knowledge to successfully operate ggplot.

> Am 23.10.2015 um 03:46 schrieb sbihorel <Sebastien.Bihorel at cognigencorp.com>:
> 
> 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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