Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 2020 by chr.schu...@gmx.de: Symbols & Matrices
http://code.google.com/p/sympy/issues/detail?id=2020
Hi,
I was wondering whether it is planned to implement matrix support for
symbols. I often use symbolic calculation for matrix equations where I
would like to do things like:
import sympy
a = sympy.Symbol('a', commutative=False, shape=(3,1)) # works
b = sympy.Symbol('b', commutative=False, shape=(3,1)) # works
c = sympy.Symbol('c') # works
eq1 = a-sympy.Matrix([c,0,0]) # unsupported operand type(s) for -: 'Symbol'
and 'Matrix'
eq2 = sympy.sympify('transpose(a)*b') # returns b*transpose(a)!
eq2.subs({a:sympy.Matrix([c,0,0]),b: sympy.Matrix([0,2,0])}) # sympify:
NotImplementedError('matrix support')
# Workaraound
sympy.sympify(str(eq2), {'a': sympy.Matrix([c,0,0]), 'b':
sympy.Matrix([0,2,0]), 'transpose': sympy.Matrix.transpose})
etc.
At the moment I find myself writing 'dirty' workarounds for each
functionality.
Is there any plan on how matrix support could be achieved? If so, I would
be more than happy to help implement it.
Regards,
Christian
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