Re: [R] extracting columns with NA's

[Peter Wolf]

antonio rodriguez wrote:

Hi All,

How do I can delete from a matrix (or array) only those columns which have
all their values set to NA?
Cheers

Antonio Rodriguez
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Try:

> x<-matrix(1:16,4,4)
> x[col(x)>=row(x)]<-NA
> x[,! apply(x,2,function(x) all(is.na(x))) ]
    [,1] [,2] [,3]
[1,]   NA   NA   NA
[2,]    2   NA   NA
[3,]    3    7   NA
[4,]    4    8   12
Peter Wolf

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