Hi
you has to provide some more info about x e.g. str(x)
x<-data.frame(price=1, h=Sys.time())
r-help-boun...@r-project.org napsal dne 08.09.2010 10:18:52:
>
> Mnay thanks fr suggestions. I am afraid this is one tough daatframe...
>
> > t = sqldf("select h, count(*) from x group by h")
> Error in sqliteExecStatement(con, statement, bind.data) :
> RS-DBI driver: (error in statement: no such table: x)
> In addition: Warning message:
> In value[[3L]](cond) : RAW() can only be applied to a 'raw', not a
'double'
did not test
>
> > t = aggregate(x["price"], by = x["h"], FUN = NROW)
> Error in sort.list(y) : 'x' must be atomic for 'sort.list'
> Have you called 'sort' on a list?
works
aggregate(x["price"], by = x["h"], FUN = NROW)
h price
1 2010-09-09 16:58:04 1
>
> > t = aggregate(x["price"], by = x["h"], FUN = length)
> Error in sort.list(y) : 'x' must be atomic for 'sort.list'
> Have you called 'sort' on a list?
works
aggregate(x["price"], by = x["h"], FUN = length)
h price
1 2010-09-09 16:58:04 1
>
> > t = tapply(x$price, by = x$h, FUN = length)
> Error in is.list(INDEX) : 'INDEX' is missing
works
use INDEX instead of by
tapply(x$price, by = list(x$h), FUN = length)
Error in is.list(INDEX) : 'INDEX' is missing
tapply(x$price, x$h, FUN = length)
2010-09-09 16:58:04
1
Regards
Petr
>
> > class(x)
> [1] "data.frame"
> > class(x$h)
> [1] "POSIXt" "POSIXlt"
> > class(x$price)
> [1] "integer"
>
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> aggregate-tp2528613p2530963.html
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