On Tue, 26 Oct 2004 [EMAIL PROTECTED] wrote: > how can I import really big plain text data files (several GB) from an
Unlikely unless you have a 64-bit platform. Only starting with R 2.0.0 can some 32-bit versions of R access files > 2Gb, and to import the file into R you need enough address space in R for the object, which is normally more than the file size. Almost certainly not if the unmentioned platform is Windows, but you could access the data from a DBMS. > ERP-System (SAP-Tables) to R? > The Header of these files are always similar, for example: > > Tabelle: T009 > Angezeigte Felder: 7 von 7 Feststehende F�hrungsspalten: 2 Listbreite > 0250 > ---------------------------------------------------------------------- > |X|MANDT|PERIV|XKALE|XJABH|ANZBP|ANZSP|LTEXT | > ---------------------------------------------------------------------- > |X|001 |01 |X | |012 |02 |ABC | > |X|001 |V9 | | |012 |04 |Okt. - Sep., 4 Sonderperioden | > |X|001 |WK | |X |053 |00 |Kalenderwochen | > ---------------------------------------------------------------------- > > (including the first 5 rows in each downloaded table, row # 4 =field names, > length of 1 row > 1023 bytes, count of fields > 256, size = several GB, > count records = several million) > > What is an appropriate way to read such tables in? > > Greetings > Stefan > > P.S. I am a beginner with R. Until now I have used ACL (http://www.acl.com) > for data mining purposes and I'm doing now my first try with R. > Yes, I have > [X] Read R Data Import/Export > [X] Read Using R for Data Analysis > [X] Read Simple R > [X] Read Manuals > [X] Read read.table() and scan() command but you have not told us your platform. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
