Re: General--LinearSolve and Precision: Impossible to solve 8x8 matrix
- To: mathgroup at smc.vnet.net
- Subject: [mg70631] Re: General--LinearSolve and Precision: Impossible to solve 8x8 matrix
- From: Bill Rowe <readnewsciv at sbcglobal.net>
- Date: Sat, 21 Oct 2006 05:14:37 -0400 (EDT)
On 10/19/06 at 3:21 AM, abdou.oumaima at hotmail.com wrote: >Greetings, >wp = 25; (* WorkingPrecision Value *) >pr = 20; (* SetPrecision Value *) >( **** Complexe functions ****) >Dimensions[L]={8,8}. >Dimensions[Y]={8}. >L and Y are function of x. >K = Normal[Series[LinearSolve[L, Y], {x, 0, 1}]]]; >I can not have result for this linear system within a reasonnable >time and with a good precision. Any suggestions will be very >welcome. Cheers. You haven't provided enough detail for anyone to give any more than a guess as to how you might achieve better results. What do you mean by "reasonable time and with a good precision"? What is the nature of the elements for L and Y? Expressions containing x as a variable? Linear? Exact coefficients? Is there any special structure to L? Perhaps band limited or upper triangular? If I show I can get what I think is good precision in what I see as reasonable time for some specific 8 x 8 matrix and 8 element vector, is that useful to you? -- To reply via email subtract one hundred and four