[R] Logical operator and lists

[arun]

Hi,
Try this:

 set.seed(5)
 list1<-lapply(1:3,function(i) data.frame(col1=sample(c(1:5,""),10,replace=TRUE), value=rnorm(10),stringsAsFactors=FALSE))
 res<-lapply(list1,function(x) {x[apply(x,2,function(y) y=="")]<-NA;x})
res[[1]]
#   col1      value
#1     2 -0.6029080
#2     5 -0.4721664
#3  <NA> -0.6353713
#4     2 -0.2857736
#5     1  0.1381082
#6     5  1.2276303
#7     4 -0.8017795
#8     5 -1.0803926
#9  <NA> -0.1575344
#10    1 -1.0717600
A.K.



----- Original Message -----
From: Dominic Roye <dominic.roye at gmail.com>
To: R help <r-help at r-project.org>
Cc: 
Sent: Tuesday, January 8, 2013 7:16 AM
Subject: [R] Logical operator and lists

Hello R-Helpers,

I have a slight problem with the expresion data[data==""] <- NA which works
well for a data.frame. But now i must use the same for a list of
data.frames.

My idea is data[[]][data==""] but it don´t work.

Thanks!!

Dominic

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