Sent from my phone. Please excuse my brevity.
On May 25, 2016 8:37:10 AM PDT, James Hirschorn <james.hirschorn at hotmail.com> wrote:
>Reduce is failing when applied to a list of elements of class
>data.table. Perhaps this is a bug?
>
>Example:
>
>library(data.table)
>
>dt1 <- data.table(x = 1:3, y = 4:6)
>dt2 <- data.table(x = 4:6, y = 1:3)
>dt3 <- data.table(x = 0:-2, y = 0:-2)
>
># This works fine
>dt1 + dt2 + dt2
># x y
># 1: 5 5
># 2: 6 6
># 3: 7 7
>
># But:
>dt_list <- list(dt1, dt2, dt3)
>Reduce("+", dt_list)
># Error in f(init, x[[i]]) : non-numeric argument to binary operator
># In addition: Warning message:
># In Reduce("+", dt_list) :
># Incompatible methods ("Ops.data.frame", "Ops.data.table") for "+"
>
>If I use data.frame instead of data.table, Reduce works properly.
>
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