If you use numarray, you *can* write
c = a-b
>>> import numarray
>>> a = numarray.array([1,2,3])
>>> b = numarray.array([5,0,2])
>>> c = a-b
>>> c
array([-4, 2, 1])numarray is packaged separately from Python. http://www.stsci.edu/resources/software_hardware/numarray Jeff
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