...still new to R and trying to figure this one out.
I have a number of variables x, y, z, etc. in a data frame.
Each contains a 2 digit year (e.g., 80, 81, 82) representing the
first year that something occurred. Each variable represents a
different type of event.
If the event did not occur at all, the variable has the value 0 (zero).
I need to create a new variable having the value of the earliest year
among the set of variables.
If none of the events occurred (all variables = 0), then the new
variable should also be zero.
e.g.,
Original
x y z
80 82 83
85 76 90
90 0 86
0 0 0
New variable
80
76
86
0
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