[R] indices of mismatch element in two vector with missing values

[Hervé Pagès]

On 07/28/2015 09:58 PM, Peter Alspach wrote:
> One way ....
>
> seq(test1)[-which(test1==test2)]

One question is whether 2 NAs should be considered to match or not.
The OP doesn't tell but I guess he wants them to match:

test1 <- c("1", "2",  NA, "4", NA, "6")
test2 <- c("1", "2", "3",  NA, NA, "66")

seq(test1)[-which(test1==test2)]
# [1] 3 4 5 6

5 should probably not be there!

H.

>
> but I imagine there are better ones .....
>
> Peter Alspach
>
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of baccts
> Sent: Wednesday, 29 July 2015 8:26 a.m.
> To: r-help at r-project.org
> Subject: [R] indices of mismatch element in two vector with missing values
>
> How would you return the index where two vectors differs if they may contain missing (NA) values?
> For example:
> test1 <- c("1","2",NA);
> test2 <- c("1","2","3");
> which(test1!=test2) does not return 3!
>
> Thanks in advance.
>
>
>
>
>
>
> --
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-- 
Hervé Pagès

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