On Aug 21, 2009, at 11:47 AM, Alexander Shenkin wrote:
Hello all,
I have a list which I'd like to convert to a data frame, while
maintaining control of the columns' data types (akin to the colClasses
argument in read.table). My numeric columns, for example, are getting
converted to factors by as.data.frame. Is there a way to do this,
Perhaps this may help:
as.data.frame(xlist,stringsAsFactors = FALSE)
> ll <-list( a=1:10, b=as.character(1:10) )
> str( as.data.frame(ll) )
'data.frame': 10 obs. of 2 variables:
$ a: int 1 2 3 4 5 6 7 8 9 10
$ b: Factor w/ 10 levels "1","10","2","3",..: 1 3 4 5 6 7 8 9 10 2
> str( as.data.frame(ll, stringsAsFactors=FALSE) )
'data.frame': 10 obs. of 2 variables:
$ a: int 1 2 3 4 5 6 7 8 9 10
$ b: chr "1" "2" "3" "4" ...
This will not force conversion to numeric if they started life as
character. Maybe you need to use lapply with as.numeric?
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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