Please read ?tapply *carefully.*
Note that in ...,list, simplify = FALSE),
"list" is the value of the FUN argument for tapply(). So, in theory, you
could replace "list" (without quotes of course) with another function such
as max or min to get the latest or earliest date. **Except** that won't
wo
Dear Peter and Rui,
There are many dates (value) in some of the cells, If we want to chose only
one date (either oldest or newest) from that cell, how can we make a table
with that condition?
For example,
Using the following code;
M <- with(daT, tapply(as.character(ObsDate), list(id, ObsSite), list
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