[R] subset error message

Sat Dec 15 21:58:38 CET 2001

Hello everybody,

I'm trying to subset a data frame "foo", which looks like this:

    sent cond  raw V1
10     2    A  614  7
11     2    A  724  6
12     2    A  641  5
13     2    A  665  9
33     5    B  510  7
34     5    B  659  7
35     5    B  607  6
37     5    B  467  8
38     5    B  586  9
39     5    B  523 10
57     8    C  858  8
58     8    C  513  9
59     8    C  739  7
60     8    C  699  7
61     8    C  585  4
79    11    D  485  8
80    11    D  704  8
81    11    D  544  7
82    11    D  461  7
83    11    D  838  8
84    11    D  655 13
85    11    D  568  6
107   15    A  467  7
108   15    A  680  7
110   15    A  741  8
130   19    B  686  7
131   19    B  717  6
132   19    B  495  8
133   19    B  480  4
134   19    B  376  7
135   19    B  470  9
148   21    C  443  6
149   21    C  771  8
150   21    C  790  8
151   21    C  653  8
152   21    C  547  7
173   25    D  550  7
174   25    D  444  7
175   25    D  491  8
176   25    D 1038  7
177   25    D 1003  9
178   25    D  661 13
179   25    D  645 10
193   28    A  652  7
194   28    A  846  6
195   28    A  571  5
196   28    A  467  8
197   28    A  597 10
206   31    B  474  7
207   31    B  534  7
208   31    B  545  7
209   31    B  610  5
210   31    B  443  8
211   31    B  454 12
212   31    B  420 10
231   35    C  549  7
232   35    C  527  6
233   35    C  408  7
234   35    C  394  8
235   35    C  396 10
244   37    D  574  8
245   37    D  711  8
246   37    D  457  8
247   37    D  556  6
248   37    D  399  8
249   37    D  425 13
250   37    D  371  7
259   39    A  644  6
260   39    A  872  8
262   39    A 1685  9
278   42    B  551  6
279   42    B  611  7
280   42    B  672  8
281   42    B  650  4
282   42    B  576  9
283   42    B  559 14
305   46    C  566  9
306   46    C  433  6
307   46    C  315  6
308   46    C 1088  9
309   46    C  463  6
320   48    D  481  6
321   48    D  642  8
322   48    D  548  8
323   48    D  507  7
324   48    D  406  9
325   48    D  380 13

When I do

>subset(foo, V1 > 5)

(I.e., when I try to remove all rows with values 5 or less in column V1)
I get this error message:

Warning message:
">" not meaningful for factors in: Ops.factor(V1, 5)

I have the same problem with ">".

However, it works fine if I do:

>subset(foo, V1 != 1 & V1 != 2 & V1 != 3 & V1 != 4 & V1 != 5)

If I try the same thing with the airquality example in the help (?subset),
the inequality works fine:

>subset(airquality, Temp > 80)

...

Thanks in advance,

-- 
Shravan Vasishth
Dept. of Linguistics, OSU
222 Oxley Hall, 1712 Neil Ave.
Columbus, OH 43210-1298
USA

URL: http://ling.ohio-state.edu/~vasishth

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