HI

Amit Patel <amitrhelp at yahoo.co.uk> [Tue, Sep 16, 2008 at 03:32:01PM CEST]:

Does anyone know an easy way to convert all the zero values in a imported csv table into NA's

Depends on the data structure you gave your imported table. In a single numeric vector (named, say, vec), the syntax is

is.na(vec[vec==0]) <- TRUE

Johannes H?sing               There is something fascinating about science. 
                              One gets such wholesale returns of conjecture 
mailto:johannes at huesing.name  from such a trifling investment of fact.                
http://derwisch.wikidot.com         (Mark Twain, "Life on the Mississippi")

Perhaps a simpler way might be to use the na argument in read.table. for
instance:

read.table( filename, na=0, ...)

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Amit Patel
Sent: Tuesday, September 16, 2008 9:32 AM
To: r-help at r-project.org
Subject: [R] HI

Does anyone know an easy way to convert all the zero values in a
imported csv table into NA's



      

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