Thank you, Steve and Sarah, for your swift replies. I didn't know about dput(). class() returns "matrix" for A, B, and C, but here:
> class(A) [1] "matrix" > class(B) [1] "matrix" > dput(A) structure(list(1239814462, 1239814601, 14349, 3, 4, 0, 12, 46601, 17801, 12401, 106001), .Dim = c(1L, 11L), .Dimnames = list( NULL, c("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k"))) > dput(B) structure(c(1239197400, 1239199200, 1239202800, 1239199199, 1239202799, 1239206399, 14342, 14342, 14342, 3, 3, 3, 0, 0, 0, 0, 0, 0, 9, 10, 11, 35999, 39599, 43199, 7199, 10799, 14399, 1799, 5399, 8999, 1799, 5399, 8999), .Dim = c(3L, 11L), .Dimnames = list( NULL, c("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k"))) > C <- rbind(A,B) > dput(C) structure(list(1239814462, 1239197400, NULL, NULL, 1239814601, 1239199200, NULL, NULL, 14349, 1239202800, NULL, NULL, 3, 1239199199, NULL, NULL, 4, 1239202799, NULL, NULL, 0, 1239206399, NULL, NULL, 12, 14342, NULL, NULL, 46601, 14342, NULL, NULL, 17801, 14342, NULL, NULL, 12401, 3, NULL, NULL, 106001, 3, NULL, NULL), .Dim = c(4L, 11L), .Dimnames = list(NULL, c("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k"))) But how do I convert A to the appropriate form for rbinding? Not simply with as.matrix(). Witness: > dput(as.matrix(A)) structure(list(1239814462, 1239814601, 14349, 3, 4, 0, 12, 46601, 17801, 12401, 106001), .Dim = c(1L, 11L), .Dimnames = list( NULL, c("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k"))) I think we're closer but I still need your help! Nick On Tue, May 1, 2012 at 12:02 PM, Steve Lianoglou < mailinglist.honey...@gmail.com> wrote: > Hi, > > On Tue, May 1, 2012 at 11:52 AM, Nick Switanek <nswita...@gmail.com> > wrote: > > Good morning, > > > > I'm running into trouble rbind-ing numeric matrices with differing > numbers > > of rows. In particular, there seem to be issues whenever a one-row > numeric > > matrix is involved. > > > > Assume A is a numeric matrix with 1 row and Y columns and B is a numeric > > matrix with X rows and Y columns. Let C be the result of rbinding A and > B. > > Then C is a numeric matrix with X + 1 rows and Y columns, only instead of > > the rows of B being "stacked" beneath the row of A as expected, the > first Y > > elements of the 1st column of B are placed in the 2nd row of C, the > > remaining values of B are discarded, and NULL values fill out the rest of > > the matrix C. > > > > The number of columns of A and B match. The colnames of A and B match. > Both > > are numeric matrices. I've pored over the rbind/cbind documentation but > > can't identify why I'm getting this behavior from rbind. I'd be extremely > > grateful for your suggestions or thoughts. > > If everything you say is true (and I'm understanding what you're > saying), there must be something else going on with your data. > Consider: > > R> m1 <- matrix(-(1:5), nrow=1) > R> m2 <- matrix(1:20, ncol=5) > R> rbind(m1, m2) > [,1] [,2] [,3] [,4] [,5] > [1,] -1 -2 -3 -4 -5 > [2,] 1 5 9 13 17 > [3,] 2 6 10 14 18 > [4,] 3 7 11 15 19 > [5,] 4 8 12 16 20 > > Can you provide a small example of your data that reproduces the > problem you're seeing? > > Construct these objects in your workspace and copy/paste the output of > dput on your m1 and m2 matrices so we can easily work w/ them. > > Cheers, > -steve > > -- > Steve Lianoglou > Graduate Student: Computational Systems Biology > | Memorial Sloan-Kettering Cancer Center > | Weill Medical College of Cornell University > Contact Info: http://cbio.mskcc.org/~lianos/contact > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.