[R] NA values

[Duncan Murdoch]

On 6/12/2006 8:48 AM, Arun Kumar Saha wrote:
> Dear all R users,
> 
> I am wondering whether there is any way to replace all "NA" values in a data
> frame by some numerical value, suppose 1000?

In a vector it is easy, e.g. x[is.na(x)] <- 1000.  A dataframe is a list 
of vectors, so you could iterate through the list, using one of the 
apply functions (or even a for loop):

apply(x, 2, function(col) {col[is.na(col)] <- 1000; col} )

which is essentially a short form for

for (i in 1:ncol(x)) {
   col <- x[,i]
   col[is.na(col)] <- 1000
   x[,i] <- col
}

Duncan Murdoch

> 
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> 
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