http://en.wikipedia.org/wiki/GAP_computer_algebra_system GAP computer algebra system GAP (Groups, Algorithms and Programming) is a computer algebra system for computational discrete algebra with particular emphasis on, but not restricted to, computational group theory. ---神奇点在范例程式，居然可以直接定义一个group order 8 然後有 3 个生成元 orz--- gap> G:=SmallGroup(8,1); # Set G to be a group of order 8. <pc group of size 8 with 3 generators> gap> i:=IsomorphismPermGroup(G); # Find an isomorphism from G to a group of permutations <action isomorphism> gap> Image(i,G); # The image of G under I - these are the generators of im G. Group([ (1,5,3,7,2,6,4,8), (1,3,2,4)(5,7,6,8), (1,2)(3,4)(5,6)(7,8) ]) gap> Elements(Image(i,G)); # All the elements of im G. [ (), (1,2)(3,4)(5,6)(7,8), (1,3,2,4)(5,7,6,8), (1,4,2,3)(5,8,6,7), (1,5,3,7,2,6,4,8), (1,6,3,8,2,5,4,7), (1,7,4,5,2,8,3,6), (1,8,4,6,2,7,3,5) ] ================================================================= http://zh.wikipedia.org/wiki/GNU_Octave GNU Octave Octave 是一个旨在提供与Matlab语法相容的开放源码 科学计算及数值分析的工具；它同时也是GNU计画成员之一。 ---这个比较普通，不过有这个说不定就可以不需要Matlab了 XD--- --

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