Data frames are column, not row oriented so you actually want your list-o-lists to be
$type [1] "BID" "BID" "BID" $price [1] 0.6178 0.6717 0.6717 $volume [1] 3e+06 3e+06 17200000 so you'd create a VECSXP of length 3 and then three data vectors (also of length 3 in this case). One STRSXP and two REALSXPs and assign them into the VECSXP. Also a names attribute for the VECSXP. There are some other attributes you have to set (the class attribute among other things) to build a real data frame, but the general structure is like that. On 11/17/06, Tom McCallum <[EMAIL PROTECTED]> wrote: > After getting one list done, I am now struggling to form a data frame in C. > > I tried to do a list of lists which gives me : > > $<NA> > $<NA>[[1]] > [1] "BID" > > $<NA>[[2]] > [1] 0.6718 > > $<NA>[[3]] > [1] 3e+06 > > > $<NA> > $<NA>[[1]] > [1] "BID" > > $<NA>[[2]] > [1] 0.6717 > > $<NA>[[3]] > [1] 5e+06 > > > $<NA> > $<NA>[[1]] > [1] "BID" > > $<NA>[[2]] > [1] 0.6717 > > $<NA>[[3]] > [1] 17200000 > > > and then as.data.frame them in R but this gives me > > > print(l); > X0.type X0.price X0.volume X1.type X1.price X1.volume X2.type X2.price > 1 BID 0.6723 3e+06 BID 0.6722 5e+06 BID 0.67195 > X2.volume X3.type X3.price X3.volume X4.type X4.price X4.volume X5.type > 1 19400000 BID 0.6723 3e+06 BID 0.6722 5e+06 BID > X5.price X5.volume X6.type X6.price X6.volume X7.type X7.price X7.volume > 1 0.6723 3e+06 BID 0.6723 3e+06 BID 0.67195 19400000 > X8.type X8.price X8.volume X9.type X9.price X9.volume X10.type X10.price > 1 BID 0.6723 3e+06 BID 0.67215 1e+07 BID 0.6723 > X10.volume X11.type X11.price X11.volume X12.type X12.price X12.volume > 1 5e+06 BID 0.67215 1e+07 BID 0.6723 3e+06 > > and so on. > > Is the only way in C to do this or is there a better way of creating a 2 > dimensional data frame with names columns? I could not find a > "data.frame" object so I assume one has to use lists but I can't see how > to get a 3 column list as the example below shows: > > a b d > 1 1 4 7 > 2 2 5 8 > 3 3 6 9 > > > Tom > > -- > Dr. Thomas McCallum > Systems Architect, > Level E Limited > ETTC, The King's Buildings > Mayfield Road, > Edinburgh EH9 3JL, UK > Work +44 (0) 131 472 4813 > Fax: +44 (0) 131 472 4719 > http://www.levelelimited.com > Email: [EMAIL PROTECTED] > > Level E is a limited company incorporated in Scotland. The c...{{dropped}} > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > -- Byron Ellis ([EMAIL PROTECTED]) "Oook" -- The Librarian ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
