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Hi, How does complex.h used in R? Whether a compiler support complex.h or not, does it affect R's performance? 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. PGI said they don't support complex.h. R configuration script printed out that doublecomplex is

Dear all, I do not seem to grasp how contrasts are set for ordered factors. Perhaps someone can elighten me? When I work with ordered factors, I would often like to be able to reduce the used polynomial to a simpler one (where possible). Thus, I would like to explicetly code the polynomial but ideally, the intial model (thus, the full polynomial) would be identical to one with an ordered factor.