Literal translation...
aggregate( mydf$value
, mydf[ , "year_month", drop=FALSE ]
, function( x ) if ( all( is.na( x ) ) ) NA else sum( x, na.rm = TRUE )
)
On September 4, 2021 9:06:57 AM PDT, Stefano Sofia
wrote:
>Dear R-list users,
>I encountered a silly problem usi
Dear R-list users,
I encountered a silly problem using aggregate, but I am not able to get rid of
it.
I read the manual quite carefully, probaby not enough.
Suppose I have the following data frame:
mydf <- data.frame(year_month=rep(c("2003-12", "2004-12", "2005-12"), 3),
station_number=c(rep(181
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