On Sat, 24 Sep 2005, Jennifer Lai wrote: > Hi, > How does complex.h used in R? Whether a compiler support complex.h > or not, does it affect R's performance?
complex.h will only used in future (2.2.0-to-be) versions of R, and only if configure finds enough C99 support. Otherwise R's own C-level complex support is used, as it always was. One would expect the OS's support to be faster and more accurate (but one could be disappointed, we have found). > I used PGI compiler to build > R-devel on AMD Opteron, but the configuration file failed to link BLAS > library despite the fact it is located in the usual location, > /usr/lib64. Look in config.log to find out why. > PGI said they don't support complex.h. R configuration > script printed out that doublecomplex is not supported. That is *FORTRAN* DOUBLE COMPLEX, and that does affect the operation of R, as without it you will not have complex linear algebra support. > Are "supporting > complex.h" and "linking BLAS library" related? No. They are completely orthoogonal concepts. -- 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 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
