[Alex Martelli] > ... > There's another free library that interoperates with GMP to remedy > this -- it's called MPFR and lives at http://www.loria.fr/projets/mpfr/. > It's also LGPL. I haven't looked much into it as it seems it's not been > ported to Windows yet (and that looks like quite a project) which is > the platform I'm currently using (and, rationals do what I need:-). Thanks for the pointer! From a quick skim, good news & bad news (although which is which may depend on POV): + The authors apparently believe their MPFR routines "should replace the MPF class in further releases of GMP". Then somebody else will port them. + Allows exact specification of result precision (which will make the results 100% platform-independent, unlike GMP's). + Allows choice of IEEE 754 rounding modes (unlike GMP's truncation). + But is still binary floating-point. Marc-Andre is especially interested in decimal fixed- and floating-point, and even more specifically than that, of a flavor that will be efficient for working with decimal types in databases (which I suspect-- but don't know --means that I/O (conversion) costs are more important than computation speed once converted). GMP + MPFR don't really address the decimal part of that. Then again, MAL hasn't quantified any of his desires either <wink>; I bet he'd be happier with a BCD-ish scheme. > ... > Hmmm, port MPFR everywhere...?-) Pearu Peterson already did the > MPFR Python wrapper interoperating with GMPY, btw -- it lives at > http://cens.ioc.ee/~pearu/misc/gmpy-mpfr/ (haven't tested it as > I can't run MPFR myself, as above explained). OK, that amounts to ~200 lines of C code to wrap some of the MPFR functions (exp, log, sqrt, sincos, agm, log2, pi, pow; many remain to be wrapped; and they don't allow specifying precision yet). So Pearu still has significant work to do here, while MAL is wondering who in their right mind would want to do *anything* with numbers except add them <wink>. hmm-he's-got-a-good-point-there-ly y'rs - tim
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