607.txt

来自「This complete matlab for neural network」· 文本 代码 · 共 35 行

发信人: fervvac (高远), 信区: DataMining
标  题: Re: 对偶性问题
发信站: 南京大学小百合站 (Wed Oct 30 21:49:59 2002), 站内信件

In a word, there are profound theories behind your seemingly simple idea 
of 1) finding a mapping from one algebra system to another and 2) use the
corresponding theorems in the new system. 

Things that seems intuitively correct are not necessarily correct. 

What I deomonstated b4 is that once you defined + to be that min operation,
your system is _intrinscially_ different from the normal matrix system. You 
either live with that fact or refine  the + operator.


【 在 helloboy (hello) 的大作中提到: 】
: thx.but I only want to find the同构 of -
: after that, I can do what I want to.
: 【 在 fervvac (高远) 的大作中提到: 】
: : In the highest level, you want to find a "mapping" between your algebra s..
: : m and the existing algebra system on matrix. 
: : Basically your system should be homo*** with the matrix one, so that you ..
: : existing algorithms / operation / theorems for the matrix system. To that..
: : you have to define what is the reverse element for any element in your sy..
: : In fact, - is not a valid operation. a - b should be a + (b -1)), where b..
: : the reverse element w.r.t. + (sorry, should be b^-1).
: : If you define + to be min, there is no reverse element for any non-zero 
: : element. That means your system is totally different from the martrix one
: : due to your definition of + operator. That beats the purpose of your appr..
: : (以下引言省略 ... ...)


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