[R] Replace NAs in one column with data from another column

[jim holtman]

?ifelse

df$newCol <- ifelse(is.na(df$col3), df$col1, df$col3)

On Wed, Sep 8, 2010 at 2:17 PM, Jakob Hedegaard
<Jakob.Hedegaard at agrsci.dk> wrote:
> Hi list,
>
> I have a data frame (m) with 169221 rows and 10 columns and would like to make a new column containing the content of column 3 but replace the NAs in column 3 with the data in column 1 (from the same row as the NA in column 3). Column 1 has data in all rows.
>
> My first attempt was:
>
> for (i in 1:169221){
> if (is.na(m[i,3])==TRUE){
> m[i,11] <- as.character(m[i,1])}
> else{
> m[i,11] <- as.character(m[i,3])}
> }
>
> Works - but takes too long time.
> I would appreciate alternative solutions.
>
> Best regards, Jakob
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?