extract vector elements of unknown range

Hi,

thanks for your quick answers! These solve my problem.

Now I have another question. I think I can use 
  head(y, -1)
instead of
  y[-length(y)]

Are there differences in terms of performance?
The latter is marginally more efficient. Take a look at head.matrix()

Cheers,
Michael
Best regards
Joseph

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extract vector elements of unknown range

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