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)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net

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.