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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