[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: LU decomposition/backsubstitution

From: Ted Harding
Subject: RE: LU decomposition/backsubstitution
Date: Mon, 06 Dec 1999 11:24:28 -0000 (GMT)

On 06-Dec-99 Thomas Hoffmann wrote:
> To solve a linear system A x = b, I use "left division" x=A\b .
> But given I have a system with fixed A and several (succesively
> computed) b's, I would like to use something like a precomputed
> decomposition of A which I can apply my b's to, to get the solutions
> for every b with minimal computational effort.

Surely setting

  B = A\U

where U is an identity matrix of appropriate dimensions, would give
you what you are looking for (to within rounding errors, anyway):

  B*b = A\U*b = A\b


E-Mail: (Ted Harding) <address@hidden>
Date: 06-Dec-99                                       Time: 11:24:28
                                                2205332 seconds left
------------------------------ XFMail ------------------------------

Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:
How to fund new projects:
Subscription information:

reply via email to

[Prev in Thread] Current Thread [Next in Thread]