Hi
Which is actually answer the OP already got.
> library(ggplot2)
> df<-data.frame(x1=c(1,2), y1=c(3,4),z1=c(5,6),w1=c(7,8))
> library(reshape2)
> dfm<-melt(df)
No id variables; using all as measure variables
> dfm$variable<-factor(dfm$variable, levels=levels(dfm$variable)[c(2,1,3,4)])
> p2<-ggplot(dfm, aes(x=rep(1:2,4), y=value))
> p2+geom_line(aes(linetype=variable))+
+ scale_linetype_manual(values=c("solid", "dashed", "dotted", "blank"),
+ labels=c("name_b","name_a","name_c", "other"))
>
Cheers
Petr
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> -----Original Message-----
> From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Jeff
> Newmiller
> Sent: Wednesday, May 23, 2018 12:56 PM
> To: John <miao...@gmail.com>; r-help <r-help@r-project.org>; David
> Winsemius <dwinsem...@comcast.net>; Rui Barradas <ruipbarra...@sapo.pt>
> Subject: Re: [R] Change the legend order by order function
>
> There are two key concepts you seem to be unaware of regarding ggplot: 1)
> you really need to put your data in long format to work with multiple curves,
> and 2) the column containing the names of the curves should be a factor with
> levels in the order you wish them to be presented in the legend (bottom to
> top). I am not in a position at the moment to give you a full reprex, but
> Google
> can probably help you find lots of examples... try keywords factor long
> ggplot.
>
> Regarding using order to do this, the answer is likely "yes" but your existing
> example order seems easier to do with an explicit listing of labels in
> sequence...
> I cannot fathom why you think name_b, name_c, name_a is a natural result of
> using the order function that people will want to see. Either be explicit or
> use
> an alphabetic order, either way does not need the order function.
>
>
>
> On May 23, 2018 10:27:14 AM GMT+02:00, John <miao...@gmail.com>
> wrote:
> >Hi,
> >
> > I'd like to graph three lines on ggplot2 and I intend the lines to be
> >"solid", "dashed", and "dotted". The legend names are "name_b",
> >"name_c", "name_a". I'd like to legend to present in the order: the
> >"name_b" at the top, and "name_a" at the bottom.
> >
> > Could it be done by order function or its inverse?
> >
> >Thanks,
> >
> >##### source code
> >
> >library(ggplot2)
> >
> >od<-order(c("name_b", "name_c", "name_a")) df<-data.frame(x1=c(1,2),
> >y1=c(3,4),z1=c(5,6),w1=c(7,8)) p1<-ggplot(df, aes(x=1:2, y=x1))+
> > geom_line(aes(linetype="name_b"))+
> > geom_line(aes(x=1:2, y=y1, linetype="name_c"), df)+
> > geom_line(aes(x=1:2, y=z1, linetype="name_a"), df)+
> >scale_linetype_manual(name="", values=c("solid","dashed",
> >"dotted")[(od)],
> >labels=c("name_b","name_c","name_a"))
> >
> >
> >#### supplement
> >> od
> >[1] 3 1 2
> >> order(od)
> >[1] 2 3 1
>
> --
> Sent from my phone. Please excuse my brevity.
>
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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