Dear All, in continuing trying to use eigen beyond the dense matrices I came across
https://eigen.tuxfamily.org/index.php?title=SpecialMatrix where the footing says "This page was last modified on 30 April 2009, at 13:51.". I tried to use the Unsupported/SkylineMatrix, however just adding #include <unsupported/Eigen/Skyline> already leads to a bunch of error messages. I assume that the internal BandMatrix is intended to be used by the end user. Yet, for me a BandMatrix would be very interesting as a type to be used by an end user, even if only the scalar product with a vector and a dense matrix is defined is defined. Is there any ongoing work in this direction? Best regards, Peter
