Message-ID: <4289AEC3.26104.416584@localhost>
Date: 2005-05-17T06:43:47Z
From: PIKAL Petr
Subject: NA erase your data trick
In-Reply-To: <Pine.LNX.4.58.0505170134070.5648@ls02.fas.harvard.edu>
Hi
Maybe
tcn5[tcn5 == -9] <- NA
if tcn5 is matrix
> mat<-matrix(rnorm(100),10,10)
> mat[5,6:7]<- -9
> mat[mat == -9]<-NA
Read some intro on data manipulation, it helps you to avoid
thinking in loops
Cheers
Petr
On 17 May 2005 at 1:37, 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?
>
> B) How do I do it right next time, I learned my lesson, I'll never do
> it again, I promise!
>
> 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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Petr Pikal
petr.pikal at precheza.cz