merge - Merging two columns into one in R -


i have following data frame, , trying merge 2 columns one, while replacing na's numeric values.

id        b 1     3     na 2     na    2 3     na    4 4     1     na

the result want is:

id    new 1     3 2     2 3     4 4     1

thanks in advance!

you can do: with(d,ifelse(is.na(a),b,a))

where d data frame.


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