[R] Add sum line to plot of multiple x values

PIKAL Petr petr.pikal at precheza.cz
Tue Mar 10 14:41:15 CET 2015 

Hi

Yes, your understanding is correct

the same can be achieved by:

p+geom_point(data=d.ag,aes(x=Group.1,y=x), size=5)+
geom_line(data=d.ag,aes(x=1:3, y=x))

as factors are treated from 1 to number of levels if given as x aestetics.

The whole code is

library(ggplot2)
people <- c("alice","bob","carol")
user <- c(rep(people,3))
files <- c(18,5,21,22,9,14,26,3,22)
date <- c(rep("2013-09-15",3),rep("2013-09-08",3),rep("2013-09-01",3))
d <- data.frame(user=user,files=files,date=date)
p <- ggplot()
p <- p + geom_line(data=d,aes(x=date,y=files,group=user,colour=user))
d.ag<-aggregate(d$files, list(d$date), sum)
p+geom_point(data=d.ag,aes(x=Group.1,y=x), size=5)+
geom_line(data=d.ag,aes(x=1:3, y=x))

Cheers
Petr

> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Loris
> Bennett
> Sent: Tuesday, March 10, 2015 1:43 PM
> To: r-help at stat.math.ethz.ch
> Subject: Re: [R] Add sum line to plot of multiple x values
>
> Loris Bennett <loris.bennett at fu-berlin.de> writes:
>
> > Hi Petr,
> >
> > See inline.
> >
> > PIKAL Petr <petr.pikal at precheza.cz> writes:
> >
> >> Hi
> >>
> >> see inline
> >>
> >>> -----Original Message-----
> >>> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of
> >>> Loris Bennett
> >>> Sent: Monday, March 09, 2015 4:35 PM
> >>> To: r-help at stat.math.ethz.ch
> >>> Subject: Re: [R] Add sum line to plot of multiple x values
> >>>
> >>> PIKAL Petr <petr.pikal at precheza.cz> writes:
> >>>
> >>> > Hi
> >>> >
> >>> > Not extremely clear what do you want to plot. Do you want to add
> a
> >>> > line which marks total number of files each day regardless of
> user?
> >>> Or
> >>> > a total number of files regardless of date coloured by user?
> >>>
> >>> Sorry, I was unclear.  I meant that I would like to plot the
> following:
> >>>
> >>> 1. For each user: the number of files for each date (my code does
> >>> this) 2. The sum of files of all users for each date (this is what
> I still
> >>>    need)
> >>>
> >>> > In each case you shall search functions geom_hline or geom_abline
> >>> >
> >>> > http://stackoverflow.com/questions/13254441/add-a-horizontal-
> line-
> >>> > to-
> >>> plot-and-legend-in-ggplot2
> >>>
> >>> So I don't want a straight line
> >>
> >> but in your code is
> >>
> >>>>
> geom_line(data=d,aes(x=date,y=sum(files),group=date),colour='black'
> >>>> )
> >>
> >> so you apparently want some sort of line.
> >
> > Yes, but see below.
> >
> >> anyway, if I do
> >>
> >> d.ag<-aggregate(d$files, list(d$date), sum)
> >>
> >> I can add
> >>
> >> p+geom_point(data=d.ag,aes(x=Group.1,y=x), size=5)
> >>
> >> and I get summary points.
> >
> > Thanks, this works.
> >
> >> If you want lines you can do
> >>
> >> p+geom_hline(data=d.ag,aes(yintercept=x, colour=Group.1))
> >>
> >> or you can fiddle with geom_segment
> >
> > I don't want an hline, just a line joining the dots I get using
> > geom_point.  I thought something like
> >
> >   p + geom_line(data=d.ag,aes(x=as.character(Group.1),y=x)
> >
> > would work.  However, while I get a plot with axes labelled in the
> > correct ranges, no line is plotted.  Explicitly setting the colour
> > with
> >
> >   p +
> > geom_line(data=d.ag,aes(x=as.character(Group.1),y=x),colour="red")
> >
> > doesn't help.  What am I doing wrong?
>
> I found the answer by googling "geom_line doesn’t draw lines".  The
> following does what I want:
>
>   ggplot(data=d.ag,aes(x=as.character(Group.1),y=x,group=1))
> +_geom_line()
>
> My understanding is that, because 'Group.1' is a factor, the 'x' values
> are not considered as belonging to the same group and geom_line only
> connects points within a group.
>
> >>> > ggplot is rather complicated but very flexible
> >>>
> >>> I don't mind ggplot being complicated, but I find the documentation
> >>> a little impenetrable.
> >>
> >> You can find plenty of help when you just try to google on the item
> >> searching. Actually this is what I do when the solution is not
> >> obvious or requires some hidden instruction.
> >
> > This is what I normally resort to with varying degrees of success.
> It
> > just seems a bit of a shame the some of the documentation for such a
> > good piece of software does indeed appear to be rather "hidden".
> >
> >> Cheers
> >> Petr
> >>
> >>>
> >>> Cheers,
> >>>
> >>> Loris
> >>>
> >>>
> >>> >> -----Original Message-----
> >>> >> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of
> >>> Loris
> >>> >> Bennett
> >>> >> Sent: Monday, March 09, 2015 2:56 PM
> >>> >> To: r-help at stat.math.ethz.ch
> >>> >> Subject: [R] Add sum line to plot of multiple x values
> >>> >>
> >>> >> Hi,
> >>> >>
> >>> >> Here are my data:
> >>> >>
> >>> >> > d
> >>> >>    user files       date
> >>> >> 1 alice    18 2013-09-15
> >>> >> 2   bob     5 2013-09-15
> >>> >> 3 carol    21 2013-09-15
> >>> >> 4 alice    22 2013-09-08
> >>> >> 5   bob     9 2013-09-08
> >>> >> 6 carol    14 2013-09-08
> >>> >> 7 alice    26 2013-09-01
> >>> >> 8   bob     3 2013-09-01
> >>> >> 9 carol    22 2013-09-01
> >>> >>
> >>> >> I would like to plot the number of files against date for all
> >>> >> users,
> >>> so
> >>> >> I have:
> >>> >>
> >>> >>   library(ggplot2)
> >>> >>
> >>> >>   people <- c("alice","bob","carol")
> >>> >>   user <- c(rep(people,3))
> >>> >>   files <- c(18,5,21,22,9,14,26,3,22)
> >>> >>   date <- c(rep("2013-09-15",3),rep("2013-09-08",3),rep("2013-
> 09-
> >>> >> 01",3))
> >>> >>   d <- data.frame(user=user,files=files,date=date)
> >>> >>
> >>> >>   p <- ggplot()
> >>> >>   p <- p +
> >>> geom_line(data=d,aes(x=date,y=files,group=user,colour=user))
> >>> >>
> >>> >> I would now like to add a line to show the total number of files
> >>> >> as
> >>> a
> >>> >> function of date.  I tried
> >>> >>
> >>> >>   p <- p +
> >>> >>
> geom_line(data=d,aes(x=date,y=sum(files),group=date),colour='blac
> >>> >> k')
> >>> >>
> >>> >> I don't get a black line, but the plot is scaled such that I can
> >>> >> see that sum(file) for all values of 'file', rather than those
> >>> >> for each date, is being used.
> >>> >>
> >>> >> I would like to know how to do this correctly, but I would
> rather
> >>> >> be able to work it out for myself.  However, if I decide, say,
> >>> >> that I don't know exactly what the 'group' argument does, how do
> >>> >> I find it out?
> >>> >>
> >>> >> ?geom_line doesn't have it, although the examples there use it.
> >>> ?ggplot
> >>> >> doesn't mention it. ?group gives me stuff about formatting text
> >>> >> arguments. ??group only leads me to ?ggplot2::add_group, which
> >>> >> also does not seem to help.
> >>> >>
> >>> >> Am I at fault for trying to learn R in an ad hoc manner, to
> which
> >>> the
> >>> >> documentation of R does not lend itself, or am I missing
> something?
> >>> >>
> >>> >> Cheers,
> >>> >>
> >>> >> Loris
> >>> >>
> >>> >> --
> >>> >> This signature is currently under construction.
> >>> >>
>
> --
> Dr. Loris Bennett (Mr.)
> ZEDAT, Freie Universität Berlin         Email loris.bennett at fu-
> berlin.de
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> PLEASE do read the posting guide http://www.R-project.org/posting-
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> and provide commented, minimal, self-contained, reproducible code.

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