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problem with elementary transformation for matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131375] problem with elementary transformation for matrix
  • From: chris zheng <zslylc at gmail.com>
  • Date: Tue, 2 Jul 2013 00:45:42 -0400 (EDT)
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  • Delivered-to: l-mathgroup@wolfram.com
  • Delivered-to: mathgroup-outx@smc.vnet.net
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Hi, All,

I used a series of elementary transformation to reduce a matrix to a tridiagonal matrix. when I wrote the program in notebook, I run step by step. everything ran well and it give me explicitly the result of a matrix.

but after I save this notebook and open it after a day, I run the whole notebook and print out the product of these elementary transformation, Mathematica does not give me explicit result of matrix, it gives me a product of these elementary transformation. do not know why. I print out Print[V] and here is  my result:

Inverse[{{1,-1,2/5},{0,2,1/5},{0,1,-(2/5)}}.Inverse[addRowMultiple[{{1,0,0},{0,1,0},{0,0,1}},-4,2,1]].Inverse[addRowMultiple[addRowMultiple[{{1,0,0},{0,1,0},{0,0,1}},-(17/5),3,2],13/5,3,1]]].{{3,-4,3/5},{2,-1,2/5},{1,-1,-(3/5}}.Inverse[addRowMultiple[{{1,0,0},{0,1,0},{0,0,1}},-4,2,1]].Inverse[addRowMultiple[addRowMultiple[{{1,0,0},{0,1,0},{0,0,1}},-(17/5),3,2],13/5,3,1]]



please help me and it is urgent for me.



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