[R] NA erase your data trick

[Detlef Steuer]

On Tue, 17 May 2005 08:33:00 +0200
Uwe Ligges <ligges at statistik.uni-dortmund.de> wrote:

> Anders Schwartz Corr wrote:
> > Oops,
> > 
> > I just erased all my data using this gizmo that I thought would replace -9
> > with NA.
> > 
> > A) Can I get my tcn5 back?
> 
> As you got it the first time. There is nothing like "undo".

If you´re lucky it still lives inside an old, not overwritten when leaving the depressing R session .RData.

Detlef

> 
> 
> > B) How do I do it right next time, I learned my lesson, I'll never do it
> > again, I promise!
> 
> By vectorization:
> 
>     tcn5[tcn5 == -9] <- NA
> 
> Uwe Ligges
> 
> 
> 
> > Anders Corr
> > 
> > 
> >>for(i in 1:dim(tcn5)[2]){         ##for the number of columns
> > 
> > +     for(n in 1:dim(tcn5)[1]){     ##for the number of rows
> > +         tcn5[is.na(tcn5[n,i]) | tcn5[n,i] == -9] <- NA
> > +
> > +         }
> > + }
> > 
> > 
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