Message-ID: <4289901C.60608@statistik.uni-dortmund.de>
Date: 2005-05-17T06:33:00Z
From: Uwe Ligges
Subject: NA erase your data trick
In-Reply-To: <Pine.LNX.4.58.0505170134070.5648@ls02.fas.harvard.edu>
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".
> 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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