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'
> 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?
> 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?
> t = tapply(x$price, by = x$h, FUN = length)
Error in is.list(INDEX) : 'INDEX' is missing
> class(x)
[1] "data.frame"
> class(x$h)
[1] "POSIXt" "POSIXlt"
> class(x$price)
[1] "integer"
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