[R] Handling "NA" in summation

[ce]

I use something like :

dataframe[ is.na(dataframe) ] <- 0 
dataframe[ is.nan(dataframe) ] <- 0 
dataframe[ is.infinite(dataframe) ] <- 0 

-----Original Message-----
From: "Olu Ola via R-help" [r-help at r-project.org]
Date: 09/06/2015 06:24 PM
To: r-help at r-project.org
Subject: [R] Handling "NA" in summation

Hello,
I am currently working with a dataframe which has some missing values represented by "NA". whenever, I add two columns in which at least one of the pair of an observation is "NA", the sum returns zero. That is for the same observation, if 

dataframe$A = 20
dataframe$B = NA

dataframe$A + dataframe$B  returns zero.

I do not want to delete the observations with the NA's. How do I go about carrying out the necessary operations without deleting the observations with the NA's

Thank you

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