[R] NA values

[Eleni Christodoulou]

Yes, thanks a lot! It works fine!

Eleni

On Nov 21, 2007 2:03 PM, Ted Harding <Ted.Harding at manchester.ac.uk> wrote:
>
> On 21-Nov-07 11:15:32, Eleni Christodoulou wrote:
> > Hi all!
> > I am new to R and I would like to ask you the following question:
> > How can I substitute the NA values with 0 in a data frame?
> > I cannot find a command to check if a value is NA...
> >
> > Thank you very much!
> > Eleni
>
> As has been said, is.na() is the function which determines
> whether something has "value" NA (result=TRUE) or not (result=FALSE).
>
> is.na() will work nicely with dataframes (also, of course, with
> structures such as vectors, matrices and arrays). Example:
>
>   dummy<-data.frame(X1=c(101,102,103,104,NA,106),
>                     X2=c(201,202,203,NA,205,206))
>
>   dummy
> #   X1  X2
> #1 101 201
> #2 102 202
> #3 103 203
> #4 104  NA
> #5  NA 205
> #6 106 206
>
>   dummy[is.na(dummy)] <- 0
>
>   dummy
> #   X1  X2
> #1 101 201
> #2 102 202
> #3 103 203
> #4 104   0
> #5   0 205
> #6 106 206
>
> Hoping this makes it clear!
> Ted.
>
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> Date: 21-Nov-07                                       Time: 12:03:33
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