What do you want with the row names? The help file for ?write.table lists a row.names argument which can be set to FALSE.
regards, Paul On 09/06/2011 02:58 PM, Mark Ebbert wrote: > Thank you for your help. > > The data is meant to be processed by a separate program that expects a simple > matrix with row and column names in ascii format. "write.matrix" does exactly > what I want except for the row names. It baffles me that this is not an > option… > > > On Sep 6, 2011, at 8:22 AM, Paul Hiemstra wrote: > >> On 09/06/2011 06:24 AM, Mark Ebbert wrote: >>> Dear R gurus, >>> >>> I am trying to write several large matrices (~ 1GB) to separate files. I >>> have learned that write.table is simply too slow for this task and was >>> attempting to use write.matrix, but write.matrix does not have the ability >>> to include row names in the output. Anyone know why that's the case? I've >>> seen a thread stating that write.matrix is the way to go for large prints >>> to files, but it doesn't do what I need it to. Since write.matrix wasn't >>> working I tried both sink and capture.output, but then the output is >>> printed to the file using the same 'width' restrictions as the general >>> "options(width=)" limit. >>> >>> Any ideas on how to print a large matrix with row names? I could write a >>> perl script to modify the files after the fact, but I shouldn't have to do >>> that. >>> >>> Thanks for your help! >>> >>> Mark T. W. Ebbert >>> ______________________________________________ >>> 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. >> Hi, >> >> What do you want with the data? If you want to store an R matrix on disk >> for later use in R, take a look at ?save. If it is for use in another >> programming language, I would write the matrix in binary format >> (?writebin). This saves a lot of space and prevents any (significant) >> rounding errors. It is probably also quite a bit faster. If you really >> need some more metadata (such as rownames), I would add a second text >> file which stores this information. Sort of a binary file plus a header, >> which is a quite common format for storing data. Maybe you can even find >> a standard binary format which you can use. But it is impossible to >> comment on this because you did not provide information as to what you >> want to do with the saved data. >> >> good luck! >> Paul >> >> -- >> Paul Hiemstra, Ph.D. >> Global Climate Division >> Royal Netherlands Meteorological Institute (KNMI) >> Wilhelminalaan 10 | 3732 GK | De Bilt | Kamer B 3.39 >> P.O. Box 201 | 3730 AE | De Bilt >> tel: +31 30 2206 494 >> >> http://intamap.geo.uu.nl/~paul >> http://nl.linkedin.com/pub/paul-hiemstra/20/30b/770 >> -- Paul Hiemstra, Ph.D. Global Climate Division Royal Netherlands Meteorological Institute (KNMI) Wilhelminalaan 10 | 3732 GK | De Bilt | Kamer B 3.39 P.O. Box 201 | 3730 AE | De Bilt tel: +31 30 2206 494 http://intamap.geo.uu.nl/~paul http://nl.linkedin.com/pub/paul-hiemstra/20/30b/770 ______________________________________________ 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.
