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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and provide commented, minimal, self-contained, reproducible code.
