[R] elimination of multiple rows

Christian Hoffmann christian.hoffmann at wsl.ch
Thu Jul 18 08:32:39 CEST 2002

Hi all,

Excuse me for posting a question which may not be true R.

I want to process a text file so that the resulting file contains only one
of possibly multiple consecutive rows. Example (the row numbers do not
belong to the file):

(1) a b c d
(2) a b c d
(3) A b c d
(4) A b c d
(5) A b c d
(6) a b c d
(7) a b c D

resulting in:

(1) a b c d
(3) A b c d
(6) a b c d
(7) a b c D

(6) could be disposed of also by first sorting the original file.

Does anybody have a script ready, preferably in Pearl? I do not know Pearl
well enough to write it myself.

Thanks for your help.

Dr.sc.math.Christian W. Hoffmann
Mathematics and Statistical Computing
Landscape Dynamics and Spatial Development
Swiss Federal Research Institute WSL 
Zuercherstrasse 111
CH-8903 Birmensdorf, Switzerland
phone: ++41-1-739 22 77    fax: ++41-1-739 22 15
e-mail: christian.hoffmann at wsl.ch
www: http://www.wsl.ch/staff/christian.hoffmann/

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