Now I got results as I wanted.
Thank you all.

On Wed, Mar 7, 2012 at 2:51 PM, AAsk <AA2e72E@lycos.co.uk> wrote:

> > x <- -1:4
> > x<0 # returns TRUE (1) or FALSE (0)
> [1]  TRUE FALSE FALSE FALSE FALSE FALSE
> > x+as.numeric(x<0)
> [1] 0 0 1 2 3 4
>
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