- array-diagonal a #!key (offset 0) (axis1 0) (axis2 1)procedure
Return diagonals of a as a shared array. Unaffected by array-default-copy. Currently only works on specialized arrays.
NOTE: Part of the implementation of this procedure is based on NumPy's C sources (translated to scheme), and is pretty gross if not inefficient.
DIFF: Offsets must be within a's bounds, since SRFI-179 does not support zero sized arrays/dimensions.