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

[PIKAL Petr]

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?

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

ggplot is rather complicated but very flexible

Petr

> -----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='black')
>
> 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.
>
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