Hello,
I’ve tried googling for an answer to this but I simply can’t find something
that fixes my problem. I have a long numerical vector with positive, negative
and null values. I want to revert the sign of the positive and negative values
and for zero to remain zero. I’ve written a function that works, except that my
vector has missing values (NA) and I need to keep those as missing values. How
could I add that to this function:
revertsign<-function(x){
if (x > 0) {x <- x*-1}
else
if (x < 0) {x <- abs(x)}
else
if (x == 0) {x <- 0}
}
I’ve tried if(is.na(x)) {x <- NA} but I get the following error message: Error
in if (x > 0) { : missing value where TRUE/FALSE needed. Which I guess is the
first NA in the vector which fails the first if of the function.
I use supply() to run the function on a vector.
Thanks for any assistance.
Cheers
Alejandro
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