Open RoyiAvital opened 10 years ago
Hi Roy,
It depends. If A (n x n) is large enough then LAMG's complexity should be O(n) whereas mldivide is O(n^3), but with a smaller hidden constant. Try a few small and increasingly larger versions of A to get a sense for the performance gain.
Oren
On Wed, Jun 4, 2014 at 4:27 AM, RoyiAvital notifications@github.com wrote:
Hello, How does LAMG compares to MATLAB's solvers ([mldivide][ http://www.mathworks.com/help/matlab/ref/mldivide.html] and [pcg][ http://www.mathworks.com/help/matlab/ref/pcg.html]) in performance?
I'm looking to solve $ A x = b $ where $ A $ is very large sparse symmetric positive definite matrix.
Thank You.
— Reply to this email directly or view it on GitHub https://github.com/orenlivne/lamg/issues/1.
Hi @orenlivne,
The problem is make
doesn't woek on my system.
I'm using Windows 8.1 64 Bit, MATLAB R2014a 64 Bit and Visual Studio 2013.
There's a problem using the eval
command (with the cd
command).
Once it works I'd be happy to show the performance in my cases.
Hi Royi,
I would like to help (although I don't have much time to work on this project so please forgive my slow responses). Can you please email me the stack trace/error message you're getting when you type make('compile')?
This should work - I believe i tested it with your system spec.
Thank you and sorry for the trouble. Oren
On Wed, Jun 4, 2014 at 8:20 AM, RoyiAvital notifications@github.com wrote:
Hi @orenlivne https://github.com/orenlivne, The problem is make doesn't woek on my system. I'm using Windows 8.1 64 Bit, MATLAB R2014a 64 Bit and Visual Studio 2013.
There's a problem using the eval command (with the cd command).
— Reply to this email directly or view it on GitHub https://github.com/orenlivne/lamg/issues/1#issuecomment-45089047.
Hello, How does LAMG compares to MATLAB's solvers (
mldivide
andpcg
) in performance?I'm looking to solve $ A x = b $ where $ A $ is very large sparse symmetric positive definite matrix.
Thank You.