[R] Weird options(digits=n) behaviour

[Peter Dalgaard BSA]

Fernando Henrique Ferraz Pereira da Rosa <mentus at gmx.de> writes:

> > options(digits=4)

> [1]  6.053  2.641 -3.639 14.259  6.082

> [1] -0.03091  1.60310 -4.90588  5.07379 -0.04418

> > options(digits=2)
> [1] -0.031  1.603 -4.906  5.074 -0.044

> [1]  6.1  2.6 -3.6 14.3  6.1

>     What is going on?

This is normal. digits=4 means that you need at least four significant
digits of the result. When you print vectors all values get printed in
the same format. Notice that in the second case -0.03091 has 4
significant digits and -0.04418 ditto and in the 3rd case likewise.
6.1 has two significant digits by the same conventions.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907