Just had to comment that I thought this question was unintentionally
funny, seeing as many of us have gone thru a lot of pain to force Excel
NOT to join lines across NA-type points in our data.
Back to the subject: if you use is.na(), just be careful to remove the
corresponding values in the x-data as well as the y-data :-) . Probably
mucking with something like
>if (y[j]=NA) y[j]<-approx({local x and y data fit})
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