Hi,

I'd like to use Eigen for numerical approximations to differential equations. One of the reasons I chose Eigen was its support for band matrices.
I have a couple of questions about the topic.
It seems that BandMatrix is not a type of sparse matrix, so it's not possible to do things like matrix multiplication. What's the reason for this?
I'm also struggling to find documentation on using the BandMatrix class. I came across this helpful thread https://forum.kde.org/viewtopic.php?f=74&t=118306&p=296188&hilit=eigen+band#p296188 on the forum, but I don't understand the last post about "filling it through its diagonals". I discovered the setConstant method, but I don't necessarily want the diagonal to be constant. How can I learn more about this?

Thanks

krey

Because of lack of man-power, so far, the BandMatrix class offers storage only. You can set any diagonal just like any vector.

Hello .
Now do you solve your problem?
Does eigen support sparse bandmatrix?

@ggael,
Any improvement on that?

There is a simple vanilla code for solving Tri Diagonal matrix system.
Could you use that?