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Forum: Main CFD Forum

July 20, 2011, 12:48

Replies: 12

Is there any c++ library that can be used for matrix calculation?

Views: 2,655

Posted By HectorRedal

Hi Nick, I need the the determinant of the...

Hi Nick,

I need the the determinant of the matrix to calculate the jacobian of the transformation (shape functions transformation) needed in the integral to calculate the different stiffness...

Forum: Main CFD Forum

July 10, 2011, 02:15

Replies: 12

Is there any c++ library that can be used for matrix calculation?

Views: 2,655

Posted By HectorRedal

Hi Arjun, I will try to take a look again...

Hi Arjun,

I will try to take a look again to the PyAMG documentation, and try to take a look again to AMG. It is a lot of information to be awre of.
This is a never ending history: :)

I will...

Forum: Main CFD Forum

July 10, 2011, 02:05

Replies: 12

Is there any c++ library that can be used for matrix calculation?

Views: 2,655

Posted By HectorRedal

Hi Nick, Thank you again for the...

Hi Nick,

Thank you again for the information.
I would like to say that the system I am trying to solve is not diagonally dominant.
The inverse I need to calculate are stiffness matrices and so...

Forum: Main CFD Forum

July 9, 2011, 02:20

Replies: 12

Is there any c++ library that can be used for matrix calculation?

Views: 2,655

Posted By HectorRedal

Hi Docfreezzz, I have taken a look at your...

Hi Docfreezzz,

I have taken a look at your blog.
Very good job, and very instructive.

You have stated that solving an sparse matrix is slower than solving a matrix using iterative methods....

Forum: Main CFD Forum

July 9, 2011, 01:29

Replies: 12

Is there any c++ library that can be used for matrix calculation?

Views: 2,655

Posted By HectorRedal

Hi arjun, Thanks for the information. I...

Hi arjun,

Thanks for the information.
I have just taken a look on PyAMG. I have searched in Google andit appears to be Python.
I was wondering how I can integrate this library in my own C++...

Forum: Main CFD Forum

July 8, 2011, 14:45

Replies: 12

Is there any c++ library that can be used for matrix calculation?

Views: 2,655

Posted By HectorRedal

Hi Nick, Thanks for your quick response. ...

Hi Nick,

Thanks for your quick response.

Yes, you are right, I am thinking of a sparse matrix.
As you perfectly states, using a dense matrix is out of scope of a normal personal computer....

Forum: Main CFD Forum

July 8, 2011, 13:22

Replies: 12

Is there any c++ library that can be used for matrix calculation?

Views: 2,655

Posted By HectorRedal

Is there any c++ library that can be used for matrix calculation?

Hi,

I am looking for a freware c / c++ library that can be used for matrix calculation.
More precisely to calculate the inverse of a matrix. A matrix whose size could be 40000x40000 entries,...

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