All,
Not sure how to characterize this (a new feature or a bug) but the behavior is
causing problems in code I've written that previously work as I expected. I
have integers that are bigger than 2^32 that
I have to encode as factors, after doing some data.table stuff (like below), it
recorders the factors as characters and corrupts subsequent merges back to
tables where these factors are ordered as
"integers".
Remedies?
tmp.dt1 <- data.table(X=as.factor(1:10), Y=rnorm(10), key="X")
tmp.dt2 <- data.table(X=as.factor(101:110), Y=rnorm(10), key="X")
rbind(tmp.dt1, tmp.dt2)
V1 Y
[1,] 1 0.47655333
[2,] 2 -0.43962704
[3,] 3 -0.78312270
[4,] 4 1.88935392
[5,] 5 -0.56413463
[6,] 6 -0.69177767
[7,] 7 -0.09942112
[8,] 8 0.21452552
[9,] 9 -0.86136222
[10,] 10 0.55623427
[11,] 101 0.02090036
[12,] 102 -0.41816481
[13,] 103 0.04798975
[14,] 104 0.93709966
[15,] 105 -0.95835181
[16,] 106 0.82207890
[17,] 107 0.85902512
[18,] 108 1.33042023
[19,] 109 0.22596849
[20,] 110 0.99209054
data.table(rbind(tmp.dt1, tmp.dt2), key="X")
X Y
[1,] 1 -0.16225884
[2,] 10 0.82979617
[3,] 101 0.22412653
[4,] 102 -0.24841475
[5,] 103 -0.09914182
[6,] 104 -1.47982574
[7,] 105 -1.79957210
[8,] 106 -2.01715940
[9,] 107 -0.81900855
[10,] 108 0.26357249
[11,] 109 -1.22742679
[12,] 110 0.64773494
[13,] 2 -0.98312948
[14,] 3 0.99937771
[15,] 4 -1.72355977
[16,] 5 -2.02481542
[17,] 6 -0.07222688
[18,] 7 0.17921321
[19,] 8 -0.92102526
[20,] 9 -0.14129584
data.table(rbind(tmp.dt1, tmp.dt2), key="X")
Damian Betebenner
Center for Assessment
PO Box 351
Dover, NH 03821-0351
Phone (office): (603) 516-7900
Phone (cell): (857) 234-2474
Fax: (603) 516-7910
[email protected]<mailto:[email protected]>
www.nciea.org<http://www.nciea.org/>
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