[R] While loop working with TRUE/FALSE?
David Winsemius
dwinsemius at comcast.net
Thu Feb 2 14:14:50 CET 2012
On Feb 2, 2012, at 6:55 AM, Chris82 wrote:
> Thanks to Berend and the others,
>
> I've found a solution which works fine for my problem.
>
> I have not only 2 vectors, but also 4.
> Question is, if q1 and q2 is equal to w1 and w2.
> The computational time is very short, also for large data.
>
> q1 <- c(9,5,1,5)
> q2 <- c(9,2,1,5)
>
> w1 <- c(9,4,4,4,5)
> w1 <- c(9,4,4,4,5)
>
> v <- vector()
> for (i in 1:(length(q1))){
> v[i] <- any((q1[i] == w1) & (q2[i] == w2))
This suggests a lack of understanding re: how to use logical
functions. The any() function is completely superfluous here. It will
return exactly the same vector as would:
q1[i] == w1) & (q2[i] == w2)
If you wanted to use any() to pick out cases where either q1[i] == w1
or q2[i]==w2 then do not put an ampersand between those arguments but
rather a comma.
--
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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