NA erase your data trick

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
+
+         }
+ }