[GiNaC-devel] [SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-185-gcbba7a5

[Jens Vollinga]

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- Log -----------------------------------------------------------------
commit cbba7a5eb9d33003c081a8017dec7da3aa990571
Author: Alexei Sheplyakov <varg at metalica.kh.ua>
Date:   Mon Feb 16 16:23:16 2009 +0200

    Univariate GCD timing: use sr_gcd when appropriate.
    
    The benchmark consists of two parts:
    1) timing of different GCD calculation methods (i.e. subresultant PRS,
       heuristic, chinese remaindering).
    2) timing of different implementations of the same method. The purpose
       is to find out how (in)efficient GiNaC::ex is as a representation
       of (univariate) polynomials (as a side note, the result is a bit
       depressing -- using coefficient vector instead of GiNaC:ex makes
       GCD calculation 50x -- 1000x faster).
    
    Now GiNaC uses modular (chinese remaindering) GCD by default, so part 2)
    got broken, i.e. instead of (intended) timings
    
    a) (heuristic, GiNaC::ex) versus (heuristic, coefficient vector)
    b) (PRS, GiNaC::ex) versus (PRS, coefficient vector)
    
    one gets
    
    a') (heuristic, GiNaC::ex) versus (heuristic, coefficient vector)
    b') (chinese remaindering, GiNaC::ex) versus (PRS, coefficient vector)
    
    Set the gcd_options::use_sr_gcd to restore the meaning of the benchmark.
    
    Note: this patch does not affect the library proper.

commit 4f2cf6aebc213c200b98fde6adb7133e8688530d
Author: Alexei Sheplyakov <varg at metalica.kh.ua>
Date:   Mon Feb 16 16:24:15 2009 +0200

    Polished NEWS a little bit.

-----------------------------------------------------------------------

Summary of changes:
 NEWS                    |    7 ++++---
 check/time_uvar_gcd.cpp |    3 ++-
 2 files changed, 6 insertions(+), 4 deletions(-)


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GiNaC -- a C++ library for symbolic computations