I am attempting to create 2D arrays which are offset copies of a given starting array. For example if I have a 2D array like this: array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]) I would like to offset it by some amount in either or both the x and y dimension. Lets say that both the x and y offset would be 1. Then I would like to have an array like this: array([[5, 6, 0], [8, 9, 0], [0, 0, 0]]) Here I don't really care about the values which are now zero. The main point is that now I can compare the data values at any given (x,y) point with the values at the adjacent point (over one on each axis). This would be useful for the kinds of calculations we need to do. I just can't come up with a numeric way to do this. Does anyone have any ideas? Thanks alot, Mike Romberg (romberg@fsl.noaa.gov)