Hi All,
How do I can delete from a matrix (or array) only those columns which have all their values set to NA?
use 'apply' to sweep through columns using a little function that sees if all values in a column are NA:
eg: x:
> x
[,1] [,2] [,3] [,4] [,5] [,6] [,7]
[1,] 0.8548990 NA NA 0.5548089 NA 0.63123175 0.1101337
[2,] 0.9593472 0.7681048 NA 0.3365029 NA 0.04580849 NA> x[,apply(x,2,function(col){!all(is.na(col))})]
[,1] [,2] [,3] [,4] [,5] [1,] 0.8548990 NA 0.5548089 0.63123175 0.1101337 [2,] 0.9593472 0.7681048 0.3365029 0.04580849 NA
I imagine solutions requiring fewer and fewer keystrokes will appear in R-help presently!
Baz
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