[R] matrix logic

[r user]

I have 2 dataframes, each with 5 columns and 20 rows.
They are called data1 and data2.I wish to create a
third dataframe called data3, also with 5 columns and
20 rows.

I want data3 to contains the values in data1 when the
value in data1 is not NA.  Otherwise it should contain
the values in data2.

I have tried afew methids, but they do not seem to
work as intended.:

data3<-ifelse(is.na(data1)=F,data1,data2)

and 

data3[,]<-ifelse(is.na(data1[,])=F,data1[,],data2[,])

Please suggest the “best” way.