[R] How to include custom na.action in function

Jim Lemon drjimlemon at gmail.com
Fri Feb 10 01:16:19 CET 2017

Hi Alejandro,
How about:

-sign(x) * sign(x) * x


On Fri, Feb 10, 2017 at 6:30 AM, Alejandro <a.gonzalezvoyer at gmail.com> wrote:
> 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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