[R] missing value where TRUE/FALSE needed
Erik Iverson
iverson at biostat.wisc.edu
Sat Nov 8 05:18:06 CET 2008
They may be the same length; that's not what the error message is
complaining about: it says there is a missing value (i.e., an NA) where
a TRUE/FALSE value is needed, therefore the 'if' doesn't know what to
do, since it is not TRUE or FALSE. So, try
summary(vector1)
summary(vector2)
sum(is.na(vector1))
sum(is.na(vector2))
to see if/where/why there are NAs in these vectors.
David Croll wrote:
> Hello dear R people,
>
>
> for my MSc thesis I need to program some functions, and some of them
> simply do not work. In the following example, I made sure both vectors
> have the same length (10), but R gives me the following error:
>
> Error in if (vector1[i] == vector2[j]) { :
> missing value where TRUE/FALSE needed
>
> I googled for possible solutions, but I did not find a good explanation
> for this...
>
>
> The code:
>
> test <- function() {
> vector1 <- sample(1:100,10)
> vector2 <- sample(1:100,10)
> for (i in vector1) {
> for (j in vector2) {
> if (vector1[i] == vector2[j]) {
> show(list(i,j))
> }
> }
> }
> }
>
> Regards, David
>
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