[R] Judging if a matrix contains any NA

[David Winsemius]

On Jul 26, 2015, at 6:10 PM, Steven Yen wrote:

> How do I judge if a matrix contain any NA or otherwise non-missing, non-numerical?
> In the following, I would like to deliver ONE logical of TRUE or FALSE, rather than a 4 x 4 matrix containing TRUE or FALSE. Thank you.
> 
> > a<-matrix(1:16,nrow=4)
> > diag(a)<-NA
> > a
>     [,1] [,2] [,3] [,4]
> [1,]   NA    5    9   13
> [2,]    2   NA   10   14
> [3,]    3    7   NA   15
> [4,]    4    8   12   NA

> any(is.na( a))
[1] TRUE


> > is.na(a)
>      [,1]  [,2]  [,3]  [,4]
> [1,]  TRUE FALSE FALSE FALSE
> [2,] FALSE  TRUE FALSE FALSE
> [3,] FALSE FALSE  TRUE FALSE
> [4,] FALSE FALSE FALSE  TRUE
> 
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David Winsemius
Alameda, CA, USA