mirror vector?
Another approach is: mat[nrow(mat):1, ] Patrick Burns patrick at burns-stat.com +44 (0)20 8525 0696 http://www.burns-stat.com (home of S Poetry and "A Guide for the Unwilling S User")
Jacques VESLOT wrote:
mat <- matrix(1:16,4,4) mat
[,1] [,2] [,3] [,4] [1,] 1 5 9 13 [2,] 2 6 10 14 [3,] 3 7 11 15 [4,] 4 8 12 16
apply(mat,2,rev)
[,1] [,2] [,3] [,4] [1,] 4 8 12 16 [2,] 3 7 11 15 [3,] 2 6 10 14 [4,] 1 5 9 13 ------------------------------------------------------------------- Jacques VESLOT CNRS UMR 8090 I.B.L (2?me ?tage) 1 rue du Professeur Calmette B.P. 245 59019 Lille Cedex Tel : 33 (0)3.20.87.10.44 Fax : 33 (0)3.20.87.10.31 http://www-good.ibl.fr ------------------------------------------------------------------- niederlein-rstat at yahoo.de a ?crit :
Hello, I'm an absolut beginner with R and now I got a 2D vector with numbers. I would like to mirror this vector now by the rows (so that the first row becomes last, second becomes one before last, ...). I don't know if there is any method I can use to do this. Could you please help me? Antje --------------------------------- Was Sie schon immer wissen wollten aber nie zu Fragen trauten? Yahoo! Clever hilft Ihnen. [[alternative HTML version deleted]]
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______________________________________________ R-help at 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.