Hello,
I've been using a pre-release version of R v 2.8.0 for Windows for the last
couple months. I think that there have been consistent problems with
subsetting data sets, but I had usually been able to find work-arounds or was
unable to confirm this as a bug. I think now I have, and would love advice on
what to do if I've made some error.
The data set in question ("c") has 500,000 observations and 44 variables. The
problematic variable, "month," takes integer values 1:12, and all are present
in the data set:
> unique(c$month)
[1] 11 10 9 8 12 1 7 4 6 2 5 3
However, I can't select observations of c for certain values of month:
> c[c$month==11,]
[1] STATE DISTRICT TALUK VILLAGE TYPE SERIALNO
INTDATE QH101P
[9] QH114 QH115A1 QH115B1 QH115C1 QH115A2 QH115B2
QH115C2 QH115A3
[17] QH115B3 QH115C3 QH115A4 QH115B4 QH115C4 QH115A5
QH115B5 QH115C5
[25] QH116 QH117A1 QH117B1 QH117C1 QH117A2 QH117B2
QH117C2 QH117A3
[33] QH117B3 QH117C3 QH117A4 QH117B4 QH117C4 QH117A5
QH117B5 QH117C5
[41] phase year month stdistid.rch
<0 rows> (or 0-length row.names)
I get the same result for c[c[,43]==11,], and
> length(c$month[c$month==11])
[1] 0
This is true for most values of month (1,2,4,5,7,8,10,11), but the multiples of
3 work, apparently correctly.
Other variables do not have this problem (the columns shift in the email, but
these three observations have month=11):
> c[c$STATE==11,][1:3,]
STATE DISTRICT TALUK VILLAGE TYPE SERIALNO INTDATE QH101P QH114 QH115A1
QH115B1 QH115C1 QH115A2 QH115B2 QH115C2 QH115A3 QH115B3
87556 11 2 1 1 1 5 1187 6 0 0
0 0 0 0 0 0 0
87557 11 2 1 1 1 10 1187 3 0 0
0 0 0 0 0 0 0
87558 11 2 1 1 1 14 1187 5 0 0
0 0 0 0 0 0 0
QH115C3 QH115A4 QH115B4 QH115C4 QH115A5 QH115B5 QH115C5 QH116 QH117A1
QH117B1 QH117C1 QH117A2 QH117B2 QH117C2 QH117A3 QH117B3 QH117C3
87556 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
87557 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
87558 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
QH117A4 QH117B4 QH117C4 QH117A5 QH117B5 QH117C5 phase year month
stdistid.rch
87556 0 0 0 0 0 0 1 1998 11
1102
87557 0 0 0 0 0 0 1 1998 11
1102
87558 0 0 0 0 0 0 1 1998 11
1102
The data set is called directly from a csv file, where all variables should be
stored in the same way, and using as.numeric(as.character(c$month)) does not
help. Nor does restarting R, restarting the computer, or trying the operation
on smaller subsets of c. I'd appreciate any help you an provide.
Sincerely,
Alan Cohen
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