[PYTHON MATRIX-SIG] [tbyang@icf.llnl.gov: Some subtlety in reaching items of a matrix]

[P. Dubois]

I think we will sooner or later get time to make the change discussed before
so that c[0,1] is a euphemism for c[(0,1)]. Assuming that, allowing
c[0][1] to be a reference while c[0,1] is a copy
doesn't seem too hard to explain to people. And I think the latter will 
be used much more than the former for use in expressions. 

I think the compromise adopted is far better than the alternatives; this 
class has to have good performance and we certainly want easy ways to 
assign values to row and columns at vector speed. 

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