General questions

Hi MTL--

I've just started using the library and I notice a few things, I figure 
I am missing something...

dot(sv1,sv2)

where sv1 and sv2 are sparse vectors, will compile and run and the dot 
product appears to always be zero.  compressed1D vectors however appear 
to compute the correct dot product.

There exists no equality operator for vectors that I can see:

assert( sv1 == sv2 );

and other operators, for instance

sv1 += sv2;

an element-by-element addition of sv2 to sv1, also do not appear to 
exist.   Can somebody clue me in?

Thanks,

-t

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