[R] Delete rows from data.frame matching a certain criteria

[mails]

Hello,


consider the following data.frame:

test <- data.frame(n = c(1,2,3,4,5), v = c(6,5,7,5,3), pattern =
c(1,1,NA,1,NA))

> test
  n v pattern
1  1     6       1
2  2     5       1
3  3     7      NA
4  4     5       1
5  5     3      NA


I tried to use apply and the adply function to set v to NA where pattern = 1
and v to v where pattern = 1


So basically the result should look like this:
> test
  n v pattern
1  1     NA       1
2  2     NA      1
3  3     7      NA
4  4     NA       1
5  5     3      NA

So far, I solved it by creating subsets and using merge but it turns out to
be super slow. Is there a way to do that
with the apply function?

Any help/hint is appreciated

Thanks


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