[R] Introduction of NA:s

[Uwe Ligges]

Patrik Waldmann wrote:
> 
> 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?


is.na(MyData[sample(outer(10 * 0:999, 6:10, "+"), 500)]) <- TRUE

Uwe Ligges
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