[R] reshape speed improvement?
ozric at web.de
Mon Jun 21 15:03:04 CEST 2004
have anybody a hint how i can perform my speed for
a big reshape jobs?
My "long" data.frame have dim 1.342.116 3 and the "wide" data.frame
could occur (if i don't filter the timevar) max. in a
246744 x 1444 data.frame with a lot of NA what could be set to 0.
Neverthless i didn't need really 1444 columns
(idependent's for data-mining) , but didn't getting
a finish reshape (for ~100 different values in timevar) since
saturday morning on a 1200MHZ Duron-512MB/ R.1.9.1 /Linux.
I check different min--vsize and min-nsize to control the swap, but it
doesn't help really?
An attempt do this in database with sql doesn't success, too - because
i recognize that's not trivial construct the columns
automatic/dynamic like reshape makes it possible.
Thanks for hints/comments
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