COMPUTE GATHER

        [SIC\]COMPUTE OutArray GATHER InArray

    Returns in a NEW 1-D variable named OutArray the list of values found in
    the (existing) n-D variable InArray.  The output array must  not  exists
    and  is created by the program itself. It is of the same type as the in-
    put array.

    NaN and Blanked values are ignored.