[PYTHON MATRIX-SIG] Slice expressions

[Perry A. Stoll]

On Thu, 17 Oct 1996, Konrad Hinsen wrote:

> > I keep making this mistake...can someone put some documentation somewhere
> > that this index_expression _must_ be indexed with all three numbers to ensure
> > correct results, which is not the case with an actual array object. 
> > 
> 
> Unfortunately there is no way to remove that restriction completely.

Agree, not within the index_expression_class. How about going back to
something from NumPy.03? to make it a little more forgiving:

def slice_generator(i=None, j=None, k=1):
    if i == None:
        if j == None:
            return index_expression[::k]
        else:
            return index_expression[:j:k]
    else:
        if j == None:
            return index_expression[i::k]
        else:
            return index_expression[i:j:k]


 -Perry


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