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delete all columns with all values equal to zero

5 messages · Frederico Mestre, Sarah Goslee, Peter Alspach +1 more

Sarah Goslee
# 
Hi,

On Thu, Dec 22, 2011 at 4:54 PM, Frederico Mestre
<mestre.frederico at gmail.com> wrote:
If this, then apply() and sum() are useful.

If the problem in the subject line (NOT the same thing), all() rather
than sum().

A reproducible example will get you usable code.

Sarah

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      Peter Alspach
    

    

      
      #
    

  


  

      
Tena koe Frederico

Something like

yourDF[, apply(yourDF, 2, sum)!=0]

HTH ....

Peter Alspach

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Frederico Mestre
Sent: Friday, 23 December 2011 10:55 a.m.
To: r-help at r-project.org
Subject: [R] delete all columns with all values equal to zero

Hello all:

 

I'm sure this is quite simple, but I tried several options and I still can't
get I right.

 

I've got a data.frame and I want to delete all columns of which the sum is
zero.

 

Any ideas? Thanks,

 

Frederico Mestre

 



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