If you are running on windows, make sure you have 'recording' checked in the
history window of the graphics.  You can also put the output to a pdf file
and view it later.

If you use table on the counts matrix:

> table(counts)
counts
  0   1   2   3
253  20   8   9
>

this shows that there were 20 single tries, 8 files downloaded twice and 9
three times.  Is this what you want?

You can also get the indices of the non-zero entries by:

> which(counts != 0, arr.ind=TRUE)
       row col
file1    1   1
file5    6   2
file1    1   3
file2    3   3
file7    8   4
file8    9   4
file1    1   5
file2    3   5
file2    3   6
.........



On 6/18/07, Matthew Trunnell <trunnell@cognix.net> wrote:
>
> Jim,
> Thanks for the quick reply!  When I run your code, I end up with a
> single barplot of one datapoint, file9 vs email20 == 2.0.  I see the
> call to barplot is inside a for loop... maybe it's zooming through the
> display of many barplots, but all I see is the last one?
>
> In any case, I need to figure out the distribution of the retries, such as
> No. Retries   Count
> 1                 6
> 2                 13
> 3                 5
> 4                 3
> 5                 2
> 6                 1
>
> That is, 6 people retried the download once; 13 people retried the
> download twice, etc.  So it would be counting the frequency of the
> email-filename combination, and grouping those together by the number
> of retries.  Does that make sense?
>
> When I look at the counts object from your code, I can see that it's
> close to what I need.  How do I access the properties of the counts
> object-- it's a table, right?  If I look at counts[1,1], that returns
> 1.  But how do I get at the row/col name of that cell?  Is that cell
> an object?  rownames(counts[1,1]) returns null.
>
> Thanks,
> Matt
>
>
> On 6/18/07, jim holtman <jholtman@gmail.com> wrote:
> > You should be using barplot and not hist.  I think this produces what
> you
> > want:
> >
> > x <- "filename,last_modified,email_addr,country_residence
> >
> > file1,3/4/2006 13:54,email1,Korea (South)
> > file2,3/4/2006 14:33,email2,United States
> > file2,3/4/2006 16:03,email2,United States
> > file2,3/4/2006 16:17,email3,United States
> > file2,3/4/2006 16:28,email3,United States
> > file3,3/4/2006 19:13,email4,United States
> > file2,3/4/2006 21:22,email5,India
> > file4,3/4/2006 21:46,email6,United States
> > file1,3/4/2006 22:04,email7,Japan
> > file2,3/4/2006 22:09,email8,Croatia
> > file1,3/4/2006 22:22,email7,Japan
> > file1,3/4/2006 22:29,email9,India
> > file1,3/4/2006 23:06,email6,United States
> > file1,3/4/2006 23:33,email6,United States
> > file5,3/4/2006 23:44,email10,China
> > file1,3/5/2006 0:13,email9,India
> > file2,3/5/2006 0:52,email8,Croatia
> > file2,3/5/2006 0:54,email8,Croatia
> > file2,3/5/2006 1:10,email5,India
> > file6,3/5/2006 2:17,email9,India
> > file2,3/5/2006 2:24,email11,Italy
> > file7,3/5/2006 2:36,email12,Italy
> > file8,3/5/2006 2:52,email12,Italy
> > file2,3/5/2006 3:09,email13,United Kingdom
> > file2,3/5/2006 4:02,email14,India
> > file2,3/5/2006 4:07,email14,India
> > file2,3/5/2006 4:14,email14,India
> > file2,3/5/2006 4:37,email5,India
> > file2,3/5/2006 4:44,email15,Belgium
> > file1,3/5/2006 5:02,email9,India
> > file1,3/5/2006 5:24,email16,Taiwan
> > file2,3/5/2006 6:06,email17,Saudi Arabia
> > file2,3/5/2006 7:32,email17,Saudi Arabia
> > file2,3/5/2006 8:12,email18,Brazil
> > file2,3/5/2006 8:26,email18,Brazil
> > file2,3/5/2006 9:49,email19,United Kingdom
> > file1,3/5/2006 10:49,email11,Italy
> > file1,3/5/2006 11:16,email13,United Kingdom
> > file1,3/5/2006 11:16,email13,United Kingdom
> > file1,3/5/2006 11:45,email13,United Kingdom
> > file1,3/5/2006 14:34,email20,Australia
> > file9,3/5/2006 14:56,email20,Australia
> > file9,3/5/2006 14:56,email20,Australia
> > file5,3/5/2006 16:43,email21,United States
> > file1,3/5/2006 17:17,email7,Japan
> > file2,3/5/2006 17:26,email22,Japan
> > file2,3/5/2006 17:27,email22,Japan
> > file2,3/5/2006 17:33,email23,China
> > file1,3/5/2006 17:45,email22,Japan
> > file2,3/5/2006 17:45,email22,Japan
> > file2,3/5/2006 17:59,email23,China
> > file1,3/5/2006 18:27,email24,Japan
> > file1,3/5/2006 18:47,email25,Taiwan
> > file2,3/5/2006 18:48,email26,New Zealand
> > file2,3/5/2006 19:15,email27,Canada
> > file2,3/5/2006 19:23,email28,Canada
> > file2,3/5/2006 19:24,email28,Canada
> > file10,3/5/2006 19:49,email29,Japan
> > file10,3/5/2006 19:52,email29,Japan
> > file10,3/5/2006 19:57,email29,Japan
> > file2,3/5/2006 20:01,email29,Japan
> > file2,3/5/2006 20:02,email29,Japan
> > file2,3/5/2006 20:06,email29,Japan"
> > d <- read.csv(textConnection(x))
> > barplot(table(d$filename), main="All Files", las=2)  # plot counts for
> all
> > the files
> > # generate plots for each file name showing which emails used them
> > counts <- table(d$filename, d$email_addr)
> > for (i in seq(nrow(counts))){
> >     .index <- which(counts[i,] > 0)
> >     barplot(counts[i, .index], las=2,
> >         names.arg=colnames(counts)[.index], main=rownames(counts)[i])
> > }
> >
> >
> >
> > On 6/18/07, Matthew Trunnell <trunnell@cognix.net> wrote:
> > >
> > > Hello R gurus,
> > >
> > > I just spent my first weekend wrestling with R, but so far have come
> > > up empty handed.
> > >
> > > I have a dataset that represents file downloads; it has 4 dimensions:
> > > date, filename, email, and country.  (sample data below)
> > >
> > > My first goal is to get an idea of the frequency of repeated
> > > downloads.  Let me explain that.  Some people tend to download
> > > multiple times, e.g. if the download fails they keep trying over and
> > > over.  I'm trying to build a histogram that shows the repeat count
> > > along the x-axis, that is, how many people downloaded once, twice,
> > > three times, etc.  I plan to compare the median of that before and
> > > after we switched ISPs.
> > >
> > > To accomplish this, I'm assuming that I'll first need to combine the
> > > email and filename columns so as to represent a single download
> > > attempt by an individual.  Does that sound right?  Later, it would be
> > > nice to limit the histogram to a single filename, country, or company.
> > > I can probably figure that out myself after I understand how to write
> > > this funky histogram expression.
> > >
> > > With the help of Verzani's introductory text, I've learned how to read
> > > in the CSV data and do some simple tables, like this:
> > >
> > > hist(table(d$filename))
> > > hist(table(d$filename[substring(d$filename, 1,
> > 5)=="file1"]))
> > > hist(sort(table(d$filename[substring(d$filename, 1,
> > 5)=="file1"])))
> > >
> > > Obviously, these commands count the frequency of the files.  What I'd
> > > like to see are the repeats grouped along the x-axis;  I'd like to
> > > find, for all files, the distribution of retries.  I hope that makes
> > > sense. :)
> > >
> > > Can someone point me in the right direction?  I'm very new to R and to
> > > statistics, but I write code for a living.  At this point I'd almost
> > > be better off writing a program do this kind of simple counting... but
> > > I have a feeling R would be so useful if I could just get past the
> > > initial learning curve.
> > >
> > > Thank you in advance,
> > > Matt
> > >
> > > Here's some real data, with the private info replaced :)
> > >
> > > d<-read.table
> > (file="C:\\users\\trunnellm\\downloads\\statistics\\downloads.csv",
> > > sep=",", quote="\"", header=TRUE)
> > >
> > > filename,last_modified,email_addr,country_residence
> > > file1,3/4/2006 13:54,email1,Korea (South)
> > > file2,3/4/2006 14:33,email2,United States
> > > file2,3/4/2006 16:03,email2,United States
> > > file2,3/4/2006 16:17,email3,United States
> > > file2,3/4/2006 16:28,email3,United States
> > > file3,3/4/2006 19:13,email4,United States
> > > file2,3/4/2006 21:22,email5,India
> > > file4,3/4/2006 21:46,email6,United States
> > > file1,3/4/2006 22:04,email7,Japan
> > > file2,3/4/2006 22:09,email8,Croatia
> > > file1,3/4/2006 22:22,email7,Japan
> > > file1,3/4/2006 22:29,email9,India
> > > file1,3/4/2006 23:06,email6,United States
> > > file1,3/4/2006 23:33,email6,United States
> > > file5,3/4/2006 23:44,email10,China
> > > file1,3/5/2006 0:13,email9,India
> > > file2,3/5/2006 0:52,email8,Croatia
> > > file2,3/5/2006 0:54,email8,Croatia
> > > file2,3/5/2006 1:10,email5,India
> > > file6,3/5/2006 2:17,email9,India
> > > file2,3/5/2006 2:24,email11,Italy
> > > file7,3/5/2006 2:36,email12,Italy
> > > file8,3/5/2006 2:52,email12,Italy
> > > file2,3/5/2006 3:09,email13,United Kingdom
> > > file2,3/5/2006 4:02,email14,India
> > > file2,3/5/2006 4:07,email14,India
> > > file2,3/5/2006 4:14,email14,India
> > > file2,3/5/2006 4:37,email5,India
> > > file2,3/5/2006 4:44,email15,Belgium
> > > file1,3/5/2006 5:02,email9,India
> > > file1,3/5/2006 5:24,email16,Taiwan
> > > file2,3/5/2006 6:06,email17,Saudi Arabia
> > > file2,3/5/2006 7:32,email17,Saudi Arabia
> > > file2,3/5/2006 8:12,email18,Brazil
> > > file2,3/5/2006 8:26,email18,Brazil
> > > file2,3/5/2006 9:49,email19,United Kingdom
> > > file1,3/5/2006 10:49,email11,Italy
> > > file1,3/5/2006 11:16,email13,United Kingdom
> > > file1,3/5/2006 11:16,email13,United Kingdom
> > > file1,3/5/2006 11:45,email13,United Kingdom
> > > file1,3/5/2006 14:34,email20,Australia
> > > file9,3/5/2006 14:56,email20,Australia
> > > file9,3/5/2006 14:56,email20,Australia
> > > file5,3/5/2006 16:43,email21,United States
> > > file1,3/5/2006 17:17,email7,Japan
> > > file2,3/5/2006 17:26,email22,Japan
> > > file2,3/5/2006 17:27,email22,Japan
> > > file2,3/5/2006 17:33,email23,China
> > > file1,3/5/2006 17:45,email22,Japan
> > > file2,3/5/2006 17:45,email22,Japan
> > > file2,3/5/2006 17:59,email23,China
> > > file1,3/5/2006 18:27,email24,Japan
> > > file1,3/5/2006 18:47,email25,Taiwan
> > > file2,3/5/2006 18:48,email26,New Zealand
> > > file2,3/5/2006 19:15,email27,Canada
> > > file2,3/5/2006 19:23,email28,Canada
> > > file2,3/5/2006 19:24,email28,Canada
> > > file10,3/5/2006 19:49,email29,Japan
> > > file10,3/5/2006 19:52,email29,Japan
> > > file10,3/5/2006 19:57,email29,Japan
> > > file2,3/5/2006 20:01,email29,Japan
> > > file2,3/5/2006 20:02,email29,Japan
> > > file2,3/5/2006 20:06,email29,Japan
> > >
> > > ______________________________________________
> > > R-help@stat.math.ethz.ch mailing list
> > > 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.
> > >
> >
> >
> >
> > --
> > Jim Holtman
> > Cincinnati, OH
> > +1 513 646 9390
> >
> > What is the problem you are trying to solve?
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?

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