I have to guess because that kind of work was only relevant to me 5 years ago, so I lost track of what everyone doing data analysis with .NET is using nowadays.
Oh I have been guessing all year long for several years although it is very relevant to what I do.
BTW I did not intend to mean that you are being unhelpful. Scientific computation just isnt a first class citizen of the .net ecosystem. Either you have to write your own or take a dependency on a commercial library for even the simplest stuff and pray that they will be around.