[R] Introduction of NA:s

[Peter Dalgaard BSA]

"Patrik Waldmann" <patrik.waldmann at djingis.se> writes:

> Hello,
> 
> I wonder if someone could help me with the following: I have
> generated 10 000 values from rnorm and now I want to randomly
> replace 500 of those with NA. The problem is that values indexed
> between 6-10,16-20,26-30.... only should be considered for
> replacement. Any suggestions?

x <- rnorm(10000)
x[sample(c(outer(-4:0,seq(10,10000,10),"+")),500)] <- NA

print(matrix(x,ncol=10,byrow=T),digits=1)


-- 
   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
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