http://ojalgo.org/
https://github.com/optimatika/ojAlgo

https://github.com/optimatika/ojAlgo/wiki
https://github.com/optimatika/ojAlgo/wiki/Getting-Started
https://github.com/optimatika/ojAlgo/wiki/Element-Consumers-and-Suppliers
https://github.com/optimatika/ojAlgo/wiki/Working-with-arrays