Hi,

Is it possible to initialize an LLT object by providing a plain Matrix that has the values for L (dense lower Matrix)? An external routine is providing me the correct values for L, however I want to use Eigen for solving. I understand that I can always recreate the original matrix A= LL* then do LLT via Eigen, but am hoping there can be a more efficient solution. Thanks.

That's not really possible. However solving from the L factor is only two lines:

x = L.triangularView<Lower>().solve(b);
x = L.triangularView<Lower>().adjoint().solve(x);

Thanks..ofcourse I should have looked at the triangular solver! That does exactly what I wanted in a two liner.