Tue Aug 17 2004 D tsukahara * derivative 0.1.1 make * GPhys::Derivative * Recast document in English * add 2nd order derivative method (given by T horinouti) * add test script end of derivative.rb Sat Aug 14 2004 D tsukahara * derivative 0.1 make * NumRu::Derivative * Recast document in English * add test script end of derivative.rb Fri Aug 13 2004 D tsukahara && T horinouti * derivative 0.0.4 make * NumRu::Derivative * add 2nd order derivative method (given by T horinouti) Fri Aug 6 2004 D tsukahara * derivative 0.0.1 make (have not been released)