Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2006
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

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


  • Prev by Date: Re: Programming style: postfix/prefix vs. functional
  • Next by Date: Re: Programming style: postfix/prefix vs. functional
  • Previous by thread: General--LinearSolve and Precision: Impossible to solve 8x8 matrix
  • Next by thread: compute limit