I have 2 data frames, M1[n,20] and M2[m,30].
If V1 and V2 are the same in both M1 and M2, then append V3-V30 from M2 onto M1.
Otherwise, continue searching for a match.
M1 is complete for all V1 and V2. M2 is missing observations for V1 or V2, or
both.
I can't figure this one out, except with reference to my old fortran-era
skills. Help!
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