On Jul 12, 2011, at 10:12 AM, Sam Steingold wrote:
I have two data frames:
str(ysmd)
'data.frame': 8325 obs. of 6 variables:
$ X.stock : Factor w/ 8325 levels
"A","AA","AA-",..: 2702 6547 4118 7664 7587 6350 3341 5640 5107
7589 ...
$ market.cap : num -1.00 2.97e+10 3.54e+08 3.46e
+08 -1.00 ...
$ X52.week.low : num 40.2 22.5 27.5 12.2 20.7 ...
$ X52.week.high : num 43.3 38.2 35.1 19.2 32.7 ...
$ X3.month.average.daily.volume: num 154 7862250 16330 205784
14697 ...
$ X50.day.moving.average.price : num 41.8 36.3 30.5 15.2 29.9 ...
str(top1000)
'data.frame': 1000 obs. of 1 variable:
$ V1: Factor w/ 1000 levels "AA","AAI","AAP",..: 146 96 341 814 382
977 66 1 737 595 ...
I want to split ysmd into two new data frames: ysmd.top1000 and
ysmd.rest so that ysmd.top1000$X.stock only contains factors from
top1000$V1 and ysmd.rest$X.stock contains all the other factors.
I should be able to just write
ysmd.top1000 <- ysmd[ysmd$X.stock "is in" top1000$V1,]
ysmd.rest <- ysmd[ysmd$X.stock "not in" top1000$V1,]
but how so I check whether a string is a member of a factor?
?"%in%"
--
Sam Steingold (http://sds.podval.org/) on CentOS release 5.6 (Final)
X 11.0.60900031
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