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

Loris Bennett loris.bennett at fu-berlin.de
Mon Mar 9 16:34:52 CET 2015


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

> ggplot is rather complicated but very flexible

I don't mind ggplot being complicated, but I find the documentation a
little impenetrable.

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='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.
>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-
>> guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
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-- 
Dr. Loris Bennett (Mr.)
ZEDAT, Freie Universität Berlin         Email loris.bennett at fu-berlin.de



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