On 03/09/2012 06:48 PM, Aaron Meurer wrote:
Maybe you could look at how Indexed does it, in
sympy/tensors/indexed.py, as it is (unfortunately, see
http://code.google.com/p/sympy/issues/detail?id=2659) always
non-commutative. Hopefully the way that it does it is correct and I'm
not just misleading you (but it does work anyway).
Aaron Meurer
On Fri, Mar 9, 2012 at 3:13 PM, Alan Bromborsky<abro...@verizon.net> wrote:
I have a class Vector where:
class Vector(Symbol):
def __init__(self,basis_str=None):
if isinstance(basis_str,Vector):
self = basis_str
else:
if basis_str == None or basis_str == '0':
self = S(0)
else:
Symbol.__init__(self,basis_str,commutative=False)
print self
print self.is_commutative
then:
er = Vector('er')
outputs my diagnostic print -
er
True
How do I subclass and get self.is_commutative = False?
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What worked for me is:
class Vector(Symbol):
def __init__(self,basis_str=None):
if isinstance(basis_str,Vector):
self = basis_str
else:
if basis_str == None or basis_str == '0':
self = S(0)
else:
Symbol.__init__(self,basis_str,commutative=False)
self.is_commutative = False
but I don't know why I should have to do it!
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