SRResult type added.
enabled stat package.
introduction of StridedNumberMatrix and Strided traits.
statistical moments module.
SRResult type added.
Moved start_offset to trait.
Made methods work with any StridedNumberMatrix
Introduced StridedFloatMatrix trait.
Implemented mean for float matrices.
mean square computation.
add_elt, sub_elt_pow_elt
power
calculation of variance of column vectors.