[R] setting elements to NA across an array

[John Fox]

Dear Dr Carbon,

Actually, it appears that I'm the one who was being obtuse. To make sure
that I'm now interpreting what you want correctly, you'd like to set all
entries in a layer to NA if any entry in a layer is NA.  If that's correct,
then how about the following?

foo[array(apply(foo, c(1,2), function(x) any(is.na(x))), dim(foo))] <- NA

Regards,
 John

--------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4
905-525-9140x23604
http://socserv.mcmaster.ca/jfox 
-------------------------------- 

> -----Original Message-----
> From: Dr Carbon [mailto:drcarbon at gmail.com] 
> Sent: Wednesday, July 27, 2005 12:45 PM
> To: John Fox
> Cc: r-help at r-project.org
> Subject: Re: [R] setting elements to NA across an array
> 
> Sorry for being obtuse. 
> 
> How can I build a logical statement that will set foo[2,2,] 
> <- NA and foo[3,5,] <- NA? Something like, if any row and 
> column are NA, then set NA to that row and column to NA for 
> the entire array....
> 
> 
> 
> On 7/27/05, John Fox <jfox at mcmaster.ca> wrote:
> > Dear Dr Carbon,
> > 
> > 
> > > -----Original Message-----
> > > From: r-help-bounces at stat.math.ethz.ch 
> > > [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Dr Carbon
> > > Sent: Wednesday, July 27, 2005 12:19 PM
> > > To: r-help at r-project.org
> > > Subject: [R] setting elements to NA across an array
> > >
> > > Please excuse what is obviously a trivial matter...
> > >
> > > I have a large 3-d array. I wish to set the third dimension
> > > (z) to NA if there are any NA values in the first two dimnesions 
> > > (xy). So, given array foo:
> > >
> > >   foo <- array(data = NA, dim = c(5,5,3))
> > >   foo[,,1] <- matrix(rnorm(25), 5, 5)
> > >   foo[,,2] <- matrix(rnorm(25), 5, 5)
> > >   foo[,,3] <- matrix(rnorm(25), 5, 5)
> > >
> > > I'll set two elements to NA
> > >
> > >   foo[2,2,1]<- NA
> > >   foo[3,5,2]<- NA
> > >   foo
> > >
> > > Now I want to set foo[2,2,] <- NA and foo[3,5,] <- NA. How can I 
> > > build a logical statement to do this?
> > >
> > 
> > That should work just as you've specified it: That is, 
> elements in all 
> > "layers" in the second row, second column and in the the third row, 
> > fifth column of the array should be NA. Since you posed the 
> question, 
> > I suppose that I'm missing something.
> > 
> > I hope this helps,
> >  John
> > 
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> > 
> >