[R] R performance, labeling questions, etc.

Uwe Ligges ligges at statistik.uni-dortmund.de
Wed Feb 26 09:00:00 CET 2003

Tony Vargas wrote:
> R helpers,
> I am trying to add labels to my graphs.  I have a Perl Program which
> generates thousands of R files like the one attached.
> My data files have 2 - 8 columns in them.  The first column of every data
> file is a header (Time) - which I want to have plotted against everything
> else.  My current formula just plots each column, which is fine, yet at
> the bottom for my labels I wind up with numbers.  What I would like to do
> is have R grab the Time label in increments of 144 data points and use
> that to label my X-axis instead of just plain numbers.  (Each data file
> has about 4400 columns).

You have somehow confused columns and rows. Anyway, you might want to 
use something like

  plot(..., xaxt="n")
  temp <- seq(1, length(Time), by = 144)
  axis(1, at = temp, labels = Time[temp])

Uwe Ligges

> I can kind of have R lable the bottom by chaning my plot to "plot(usr.cpu
> ~ Time), yet then the graphs take much, much longer to generate.
> Worst case, I will use "plot(usr.cpu ~ Time)" - yet, anyone know why this
> would take a very, very long time?
> Any ideas?
> Thanks,
> Tony
> Tony Vargas
> Cisco Systems
> Engineering Computing Services
> (408) 525-4113
> tvargas at cisco.com

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