I am running into an issue using a quote with eval in 'j'. I think I had a
similar issue with 'by' in the past; maybe it is a similar bug.
Use the following code to reproduce:
---------------------
foo <- function( data, fcn ) {
q <- substitute( fcn )
# The following line works
#data[ , eval( q ), by=a ]
# The following line causes an error
data[ , eval( substitute( fcn ) ), by=a ]
}
num <- 10
DT <- data.table( a=rep(c("A","B"),num), b=1:(num*2) )
foo( DT, sum(b) )
---------------------
Notice the two lines inside foo(). They should be logically equivalent, but
only one works.
Is this a bug?
Harish
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