[R] how to handle missing values "." when importing data in R

[karena]

Hi, tim,

thank you very much for the reply, but I am really a new user. How to change
all NAs to zero?

thanks again.

karena


jholtman wrote:
> 
> ?read.table
> 
> na.strings='.'
> 
> Then change all NAs to zero     df$col[is.na(df$col)] <- 0
> 
> On Tue, Jan 12, 2010 at 12:46 PM, karena <dr.jzhou at gmail.com> wrote:
> 
>>
>> hi, I have a question about importing data in R.
>>
>> I want to import a file which has missing value in it, and the missing
>> values are denoted as ".", I want to first read in the file, and then
>> change
>> the "." into the number zero "0".
>>
>> how can I do that?
>>
>> thank you,
>>
>> karena
>> --
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>> ______________________________________________
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>> and provide commented, minimal, self-contained, reproducible code.
>>
> 
> 
> 
> -- 
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
> 
> What is the problem that you are trying to solve?
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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