Dear Liang Zhou, There is also a set of functions named ibis::part::get2DBins that might satisfy your needs as well if you can use ibis::part class directly.
John On Thu, Jul 29, 2010 at 12:34 AM, Zhou Liang <[email protected]> wrote: > On 7/28/2010 10:42 PM, Zhou Liang wrote: > > On 7/27/2010 8:09 PM, Zhou Liang wrote: > >> Kesheng Wu wrote: > >>> Dear Liang Zhou, > >>> > >>> The constraints are the conditions in the "conditional histogram". > >>> > >>> John > >>> > >>> > >>> On Tue, Jul 27, 2010 at 1:54 PM, Liang Zhou<[email protected] > >>> <mailto:[email protected]>> wrote: > >>> > >>> Hi all, > >>> I'm new to Fastbit, and I'm trying to compute histogram between > two > >>> columns. However, I'm not sure what the first arg 'constraints' > means, > >>> and I cannot find explanation on it throughout the doc. Any help > would > >>> be very grateful! Thanks! > >>> > >>> Regards, > >>> Liang > >>> _______________________________________________ > >>> FastBit-users mailing list > >>> [email protected]<mailto:[email protected] > > > >>> https://hpcrdm.lbl.gov/cgi-bin/mailman/listinfo/fastbit-users > >>> > >>> > >>> > ------------------------------------------------------------------------ > >>> > >>> _______________________________________________ > >>> FastBit-users mailing list > >>> [email protected] > >>> https://hpcrdm.lbl.gov/cgi-bin/mailman/listinfo/fastbit-users > >>> > >> Thanks! I actually do want to compute conditional histogram. Seems the > >> problem is caused by bin number and the vector size. > >> > >> > >> Liang > >> _______________________________________________ > >> FastBit-users mailing list > >> [email protected] > >> https://hpcrdm.lbl.gov/cgi-bin/mailman/listinfo/fastbit-users > > That problem fixed, it turned out that I fed the table with type > > different than I indicated. Now, I want to compute the conditional > > histograms for all combination of two attributes of a table of records, > > what is the best way? I can create the subset table by 'table::select' > > using the query condition, but I'm not sure how to compute the > > conditional histograms from it as we don't know the range for attributes > > other than those appeared in the query condition. Perhaps, we need to > > traverse the subset table and determine the ranges and feed into > > 'table::getHistogram2D'? Any ideas? > > > > Thanks, > > Liang > > _______________________________________________ > > FastBit-users mailing list > > [email protected] > > https://hpcrdm.lbl.gov/cgi-bin/mailman/listinfo/fastbit-users > Ok, I think I got it, just put constraints into table::getHistogram2D > with the axises I want, then I'll get want I want. > _______________________________________________ > FastBit-users mailing list > [email protected] > https://hpcrdm.lbl.gov/cgi-bin/mailman/listinfo/fastbit-users >
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