Comment #4 on issue 4045 by [email protected]: word 'Matrix'
is present when displaying a matrix
http://code.google.com/p/sympy/issues/detail?id=4045
I think Aaron discussed this adequately, but I just want to reiterate that
sometimes there is some "noise" in the output that allows you to know
exactly what you are looking at. Without the leading Matrix the output
looks like a tuple of lists...but a tuple of lists has none of the Matrix
attributes. Similarily, Point(1,2) is printed rather than (1,2) for a
coordinate point so you know you are dealing with a geometry Point
instance, not simply a tuple. Think of that noise as "context". And that
context is what allows the parser to reconstruct the copy-and-pasted
expression with sympify.
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