[R] Select maximum subset

[arun]

Hi,

Just to make it more general.
z1<-data.frame(z)
z1[colSums(is.na(z1))<=min(colSums(is.na(z1[,-1])))]
#  id  a  b
#1  1  4  3
#2  2  3 NA
#3  3  2  2
#4  4 NA  7
#5  5  1  1
A.K.




----- Original Message -----
From: Evgenia <evgts at aueb.gr>
To: r-help at r-project.org
Cc: 
Sent: Sunday, December 23, 2012 4:16 PM
Subject: [R] Select maximum subset

Suppose i have matrix z
id<-c(1,2,3,4,5)
a <- c(4, 3, 2, NA, 1)
b <- c(3, NA, 2, 7, 1)
c <-c(3, NA, NA, 7, NA)

z<- cbind(id,a, b,c)

     id  a  b  c
[1,]  1  4  3  3
[2,]  2  3 NA NA
[3,]  3  2  2 NA
[4,]  4 NA  7  7
[5,]  5  1  1 NA


I want to select those columns for which I have the smallest number of NA

In my example, these would be column1 and 2

since they give me 
4    3
2    2
1    1

My real example have alot of columns and I want to find and save  all
possible subsets 

Thanks, alot

Evgenia



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