[R] Computational speed question
Hello, I'm doing bootstrap in R 2.4.1 in order to compute standard errors of an estimator. I'm running the same program on 4 computers. The core of the program is a nlm minimization of a function, which is (I believe) nicely coded using (t)apply and all the vectorized stuff. I'm slightly puzzled by the differences in the speed of computation. The program works twice as fast on a two years old Celeron (256 MB, running Ubuntu Dapper Linux) than on a P4 (1GB, Windows 2000 + Novell) and the speed of that Celeron is comparable with an other P4 (1GB, Ubuntu Feisty Linux). In general (outside R, text editing, whatever), the Celeron is much slower than any of the two P4. Is there any reason for this ? Is R better optimized for Linux ? Some options I might have used when installing R on one of the Linuxes and not on the other one ? Thanks for an answer. David Vonka __ R-help@stat.math.ethz.ch 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.
[R] Is it possible to only read a subset by read.table ?
Hello, is it possible to do something like DATA - read.table(file=blabla.dat,subset=(sex==male)), i.e. make R read only a subset of a csv file ? I think it would be useful in case of very big datasets, but I can't find such a feature. Thanks for an answer, David Vonka __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] R-2.2.1 doesn't compile under cygwin/Win2000
Hello, I've just downloaded the R-2.2.1 source and I'm trying to compile it under cygwin (1.5.19-4). The configure script runs ok, but make generates the following error after a while: - al/include -DHAVE_CONFIG_H -D__NO_MATH_INLINES -g -O2 -c zutil.c -o zutil.o rm -f libz.a ar cr libz.a adler32.o compress.o crc32.o deflate.o gzio.o infback.o inffast.o inflate.o inftrees.o trees.o uncompr.o zutil.o ranlib libz.a make[4]: Leaving directory `/home/Vonkad/R-2.2.1/src/extra/zlib' make[3]: Leaving directory `/home/Vonkad/R-2.2.1/src/extra/zlib' make[3]: Entering directory `/home/Vonkad/R-2.2.1/src/extra/xdr' make[4]: Entering directory `/home/Vonkad/R-2.2.1/src/extra/xdr' making xdr.d from xdr.c making xdr_float.d from xdr_float.c making xdr_mem.d from xdr_mem.c making xdr_stdio.d from xdr_stdio.c make[4]: Leaving directory `/home/Vonkad/R-2.2.1/src/extra/xdr' make[4]: Entering directory `/home/Vonkad/R-2.2.1/src/extra/xdr' gcc -I. -I. -I../../../src/include -I../../../src/include -I/usr/local/inclu de -DHAVE_CONFIG_H -D__NO_MATH_INLINES -g -O2 -c xdr.c -o xdr.o In file included from xdr.c:59: ./rpc/types.h:63: error: conflicting types for 'malloc' ./rpc/types.h:63: error: conflicting types for 'malloc' make[4]: *** [xdr.o] Error 1 make[4]: Leaving directory `/home/Vonkad/R-2.2.1/src/extra/xdr' make[3]: *** [R] Error 2 make[3]: Leaving directory `/home/Vonkad/R-2.2.1/src/extra/xdr' make[2]: *** [R] Error 1 make[2]: Leaving directory `/home/Vonkad/R-2.2.1/src/extra' make[1]: *** [R] Error 1 make[1]: Leaving directory `/home/Vonkad/R-2.2.1/src' make: *** [R] Error 1 -- What could be the cause ? Regards and thanks, David Vonka __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
