Thank you Jens. I will try your solutions and post the solutions/problems I have. Cheers Peter
2010/1/7 Jens Oehlschlägel <oehl_l...@gmx.de> > Peter, > > ff objects are not allowed as subscripts to ff objects. You can take > several routes > > 1) use bit objects instead of logical or ff logical. This is fast and takes > factor 32 less RAM than logicals (BTW bit objects can be coerced to ff via > as.ff() and as.bit() but they convert to vmode "boolean" (1 bit), not > "logical" (2 bits). Examples for working with bit are on > http://ff.r-forge.r-project.org/ff&bit_UseR!2009.pdf > > 2) convert your logicals into positive integer subscripts (assuming that > there are not too many elements selected, as you assume if writing > bigData[select,] > > 3) keep your logical in a ff logical or ff boolean and then do chunked > looping over both - the ff with the subscripts and the ffdf - and in each > chunk convert the logical selection to integers, see 2) > > HTH > > > Jens Oehlschlägel > > > P.S. you might want to try the newer version on r-forge. It has several > improvements but is not yet on CRAN because there is currently some issue > with snow leopard. > > [[alternative HTML version deleted]]
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