[R] NA erase your data trick

[Uwe Ligges]

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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