Some of those 3’s are actually bitmask options for Eigen’s template class. I’m not sure offhand what they all stand for; but this is part of the nature of template libraries: the compiler symbols are really hard to decipher. 
David
Some of those 3’s are actually bitmask options for Eigen’s template class. I’m not sure offhand what they all stand for; but this is part of the nature of template libraries: the compiler symbols are really hard to decipher.
David