On 2013-04-01 15:06, Ted Harding wrote:
On 01-Apr-2013 21:26:07 Robert Baer wrote:
On 4/1/2013 4:08 PM, Peter Ehlers wrote:
On 2013-04-01 13:37, Ted Harding wrote:
Greetings All.
This is a somewhat generic query (I'm really asking on behalf
of a friend who uses R on Windows, whereas I'm on Linux, but
the same phenomenon appears on both).
Say one has a largish dataframe -- call it "G" -- which in the
case under discussion has 592 rows and 41 columns. The intention
is to display the data by simply entering its name (G) as command.
Say the display console has been set wide enough to display 15
columns (determined by lengths of column names). Then R will output
succesively to the console, in continuous flow:
Chunk 1: rows 1:592 of columns 1:15
Chunk 2: rows 1:592 of columns 16:30
Chunk 3: rows 1:592 of columns 31:41
If the number of rows that can be displayed on the screen is, say, 60,
then only rows 533:592 of Chunk 3 will be visible in the first instance.
However, on my Linux system at any rate, I can use Shift+PgUp to
scroll back up through what has been output to the console. It seems
that my friend proceeds similarly.
But now, after a certain number of (Shift+PgUps), one runs out
of road before getting to Row 1 of Chunk 1 (in my friend's case,
only Rows 468-592 of Chunk 1 can be seen).
The explanation which occurs to me is that the console has a "buffer"
in which such an output is stored, and if the dataframe is too big
then lines 1:N (for some N) of the output are dropped from the start
of the buffer, and it is impossible to go further back than line (N+1)
of Chunk 1 where in this case N=467 (of course one may not even be
able to go further back than Chunk K, for some K > 1, for a bigger
dataframe).
The query I have is: In the light of the above, is there a way to
change the size of the "buffer" so that one can scroll all the way
back to the very first row of Chunk 1? (The size-change may perhaps
have to be determined empirically).
Isn't this set by the 'bufbytes' and 'buflines' specifications in the
Rconsole file?
Anyway, it's probably best to use 'View' to inspect data.
Although I have not tried them, Windows RGUI [ -- Edit | GUI
Preferences --] has settings for both buffer and lines which on my
64-bit machine default to 250000 and 8000 respectively.
Rob Baer
Peter Ehlers
Thanks for the replies, Rob and Peter. Rob's reply in particular
corresponds to what my friend has himself just found out in his
Windows installation of R. It seems, however, that this setting
is once-and-for-all in an R session (I can't check that myself).
Re Peter's comment: I don;t seem to have an "Rconsole" file
anywhere in my Linux installation. Is it unique to Windows?
Yes, I believe Rconsole is Windows only. But let me re-iterate my
advice: use View() to inspect a data.frame. When I need to do a
fair bit of this and find that typing "View" is too much effort,
I save a couple of keystrokes by redefining .V <- View. The nice
thing is that you can scroll both horizontally and vertically
and you can even do it sans mouse (arrow/page keys).
Peter Ehlers
Once again, thanks. Very helpful.
Ted.
-------------------------------------------------
E-Mail: (Ted Harding) <ted.hard...@wlandres.net>
Date: 01-Apr-2013 Time: 23:06:21
This message was sent by XFMail
-------------------------------------------------
______________________________________________
R-help@r-project.org 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.
