EXTRACT-CENTERED-WINDOW (VECTOR CENTER SIZE &OPTIONAL (ELEMENT-TYPE (ARRAY-ELEMENT-TYPE VECTOR)))
Extract a subsequence of SIZE from VECTOR, centered on CENTER and padding with zeros beyond the edges of the vector.
EXTRACT-CENTERED-WINDOW-INTO (VECTOR CENTER SIZE DESTINATION)
Extract a subsequence of SIZE from VECTOR, centered on OFFSET and padding with zeros beyond the boundaries of the vector, storing it to DESTINATION.
EXTRACT-WINDOW-INTO (VECTOR START LENGTH DESTINATION)
Copy an extent of VECTOR to DESTINATION. Outside of its legal array indices, VECTOR is considered to be zero.