[R] Replacing 0s with NA

[Gabor Grothendieck]

Also try this:

X[X == 0] <- NA

or

X2 <- replace(X, X == 0, NA)


On Fri, Jun 12, 2009 at 5:54 AM, Chuck Cleland<ccleland at optonline.net> wrote:
> On 6/12/2009 4:55 AM, Christine Griffiths wrote:
>> Hello
>>
>> I have a dataset in which I would like to replace 0s with NAs. There is
>> a lot of information on how to replace NAs with 0, but I have struggled
>> to find anything with regards to doing the reverse. Any recommendations
>> would be great.
>
> X <- as.data.frame(matrix(sample(0:9, 100, replace=TRUE), ncol=10))
>
> X
>   V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
> 1   7  5  8  9  6  6  4  8  5   8
> 2   6  2  9  6  8  5  9  1  1   3
> 3   4  1  5  8  9  5  3  2  1   4
> 4   4  8  7  7  4  1  1  4  9   8
> 5   9  2  5  8  4  8  4  8  6   0
> 6   3  4  2  8  2  0  6  4  8   5
> 7   3  5  0  2  7  7  9  9  3   1
> 8   7  3  3  4  8  3  9  2  7   1
> 9   4  7  9  1  5  4  8  2  1   9
> 10  7  7  6  1  0  9  0  5  7   0
>
> X[] <- lapply(X, function(x){replace(x, x == 0, NA)})
>
> X
>   V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
> 1   7  5  8  9  6  6  4  8  5   8
> 2   6  2  9  6  8  5  9  1  1   3
> 3   4  1  5  8  9  5  3  2  1   4
> 4   4  8  7  7  4  1  1  4  9   8
> 5   9  2  5  8  4  8  4  8  6  NA
> 6   3  4  2  8  2 NA  6  4  8   5
> 7   3  5 NA  2  7  7  9  9  3   1
> 8   7  3  3  4  8  3  9  2  7   1
> 9   4  7  9  1  5  4  8  2  1   9
> 10  7  7  6  1 NA  9 NA  5  7  NA
>
>> Cheers
>> Christine
>>
>> ______________________________________________
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>> and provide commented, minimal, self-contained, reproducible code.
>
> --
> Chuck Cleland, Ph.D.
> NDRI, Inc. (www.ndri.org)
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>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>