From Wikipedia, to handle missing window entries at the boundaries of the signal, there are some schemes that have different properties that might be preferred in particular circumstances:
- The first value is repeated, as with the last value, to obtain enough entries to fill the window.
- Avoid processing the boundaries, with or without cropping the signal boundaries afterwards.
- Shrinking the window near the boundaries, so that every window is full.
- Fetching entries from other places in the signal.
