File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Performance and the fly likes Solving linear equation systems including sparse matrices Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of Murach's Java Servlets and JSP this week in the Servlets forum!
JavaRanch » Java Forums » Java » Performance
Bookmark "Solving linear equation systems including sparse matrices" Watch "Solving linear equation systems including sparse matrices" New topic

Solving linear equation systems including sparse matrices

Gregor Franz

Joined: Nov 22, 2012
Posts: 1
Hi everyone,

Working on a Java project, I face the following problem:

I would like to solve a linear equation system of the form

A * x = b.

Therein, the matrix ‘A’ and both vectors ‘x’ and ‘b’ contain several thousand array elements. ‘A’, however, is a sparse matrix and only a small number of diagonals of ‘A’ may contain values that differ from zero.

The use of Java standard solvers results in very long computation times as these solvers normally do not use the specific properties of sparse matrices. Therefore I would like to ask if someone knows packages that include linear equation solvers which are able to solve systems as described above in a reasonable time.

I would be very grateful for any hint.

Thanks a lot in advance and best regards
Ulf Dittmer

Joined: Mar 22, 2005
Posts: 41065
The Apache Commons Math library can handle linear equation systems, but it's not optimized for sparse matrices, so it'll most likely not work with systems of this size.

The Colt library hasn't been updated in a long time, but it does claim to support sparse matrices, so may be worth checking out.

Ping & DNS - my free Android networking tools app
Darryl Burke

Joined: May 03, 2008
Posts: 4523

Gregor, please BeForthrightWhenCrossPostingToOtherSites

luck, db
There are no new questions, but there may be new answers.
It is sorta covered in the JavaRanch Style Guide.
subject: Solving linear equation systems including sparse matrices
Similar Threads
2 dimension array
How to take linear equation as input.
Newton Rapson library for APR calculator in JAVA
how to read in an n * n matrix and how to form it?
Array of Nulls