window( {axis}, x, y)

Define the window (with the starting point and the ending
point) on which data is actually used for the iteration. Data
outside this window(displayed as 0 during the interactive input) are
just ignored for the processing. Window can be entered several time,
the result being cumulative.

see also : window_reset window_mode put apply

NPK Documentation, version 0.995 - 2009-10-14