[R] Vector allocation problem while trying to plot 6 MB data file

[Ramon Hofer]

Thanks for your answer Uwe


On Fri, 03 May 2013 23:36:24 +0200
Uwe Ligges <ligges at statistik.tu-dortmund.de> wrote:
 
> On 02.05.2013 14:37, Ramon Hofer wrote:
> >
> > I'm trying to analyse the network speed and used iperf to create a
> > csv file containing the link test data. It's only about 6 MB big but
> > contains about 40'000 samples.
> >
> > I can do boxplots (apart from printing the number of samples but I
> > ask separately for that).
> >
> > To find the behaviour over time I wanted to plot the throuphput. So
> > I have this command:
> >
> > plot(A$Timestamp, A$Bandwidth.bit.sec., xlab = "Timestamp", ylab =
> > "Bandwidth [bit/s]", ylim = quantile(A$Bandwidth.bit.sec.,
> > c(0, .99), na.rm = TRUE))
> >
> > Unfortunately I get this:
> > Error: cannot allocate vector of size 12.5 Gb
> 
> 40000 samples and 6MB can't be the issue unless this is not a regular 
> plot but the classes of A$Timestamp or A$Bandwidth.bit.sec are rather 
> special.

This should be a standard plot. I can't tell exactly as I'm new to R...


> What do
> str(A$Timestamp)

Factor w/ 40886 levels "2013-04-29_10:31:47.189194629",..: 1 2 3 4 5 6
7 8 9 10 ...


> str(A$Bandwidth.bit.sec.)

int [1:40886] NA 79106 86086 49918 96353 97268 98027 99369 98049
97280 ...


> Can you make a reprducible examples available?

You can find the data here:
http://people.ee.ethz.ch/~hoferr/download/data.csv

The script I have so far:
http://people.ee.ethz.ch/~hoferr/download/draw_graph.R

The same error occurs if I start a new R session and enter these two
commands:

 A <- read.csv('data.csv')
 plot(A$Timestamp, A$Bandwidth.bit.sec., xlab = "Timestamp", ylab =
 "Bandwidth [bit/s]", ylim = quantile(A$Bandwidth.bit.sec., c(0, .99),
 na.rm = TRUE))


Best regards
Ramon