R help - Oct 2012 - convert ff_vector object into as.Date

hello R Users!

Can anybody please help me how to convert ff_vector object into as.Date &
then I have apply  ffwhich condition?

class(y_in_ffdf$dateval)
[1] "ff_vector" "ff"       

y_in_ffdf$dateval <- as.Date(y_in_ffdf$dateval)
Error in as.Date.default(y_in_ffdf$dateval) : 
  do not know how to convert 'y_in_ffdf$dateval' to class
"Date"
  
y_in_ffdf <- y_in_ffdf[ffwhich(y_in_ffdf$dateval >= max_span_start_date),]

Thanks,
BHarat



-----
Bharat Warule 
Pune
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This might be what you are looking for. It uses with.ffdf from package
ffbase.

require(ffbase)
y_in_ffdf$dateval <- with(y_in_ffdf, as.Date(dateval) )

Jan



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