Is there any paper or research concerning float128 arithmetics applied to linear algebra problems(e.g. iterative solvers, decompositions etc.)?
How much benefit is really there in comparison with double?
How much slower is it?
I've discovered this toolbox: http://www.advanpix.com/ Unfortunately it is commercial, but results if they are true, look impressive.
sym()
when declaring the matrix and have any precision but it is horribly slow. $\endgroup$