> huh? 
> sage: m=matrix([[1,2],[3,4]]) 
> sage: m 
> [1 2] 
> [3 4] 
> sage: m[1,1]=100 
> sage: m 
> [  1   2] 
> [  3 100] 
> sage: 
>

Yes, you're right. My issue with matrices is that I can't write something 
like:

sage: matrix([[1,0],[None,0]])

(Unless, of course, you want to correct me again:)

A.
 

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