[SciPy-dev] Arrays and matrices share memory?

[Stephen Walton]

Travis Oliphant wrote:

>Ah, good catch.  Yes, I believe that mat(A) shares the same data with 
>A.  If this was not the default previously, then it needs to change.  
>  
>
Copy was the default previously.  If you look at Matrix.py in Numeric 
23.8, you'll see the default value of copy in the __init__ method of the 
Matrix class is 1, while it is presently 0 in the __new__ method of the 
new matrix class.  Changing this allows expm3 and friends to work 
properly again.