Hi,
I am trying to get fread() to read NA without coercing the entire column to
character, but I am unable to do it. Please tell me whether I am doing
something wrong or this is a bug.
# Load two data tables with a column of integers -- one with NA and one without
dt1 <- fread( "a\n2\n4\n8\n5", na.strings=c("?") )
dt2 <- fread( "a\n2\n4\n?\n5", na.strings=c("?") )
# The contents of both are as expected (or so it seems)
dt1
dt2
# The class of the column with NA is character
class( dt1$a )
class( dt2$a ) # Not expecting this to be character
# Even setting colClasses does not help
dt3 <- fread( "a\n2\n4\n?\n5", na.strings=c("?"), colClasses=c(a="integer") )
class( dt3$a )
Thanks for your help.
Regards,
Harish
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