<@U0HUJ25V1> I've also added one small feature to ...

# mathematics

[altavir]

@thomasnield I've also added one small feature to the matrix implementation, namely features. It is well known, that linear algebra performance could be optimized if one knows if it is a special matrix, like sparse or diagonal. Commons math approach it by using special types for special matrix. But I find type system complicated as is. Instead I've added possibility to add markers to matrix. I still need some use-cases to understand, what people like to do with them.