[R] mirror vector?

[Jacques VESLOT]

 > 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

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Jacques VESLOT

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niederlein-rstat at yahoo.de a écrit :
> 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
> 
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