#var('d,e,f')
from sympy import *
x,y,z = symbols("x y z")
A = matrix([[1,2,3],[3,2,1],[1,1,1]])
w = vector([d,e,f])
A*w
I am getting this error.Please help me
Traceback (most recent call last): A*w
File "", line 1, in <module>
File "/tmp/tmpufgyTp/___code___.py", line 7, in <module>
w = vector([d,e,f])
File "free_module_element.pyx", line 496, in
sage.modules.free_module_element.vector
(build/cythonized/sage/modules/free_module_element.c:4828)
File "free_module_element.pyx", line 593, in
sage.modules.free_module_element.prepare
(build/cythonized/sage/modules/free_module_element.c:5319)
File
"/home/thyagarajulu/Sage/local/lib/python2.7/site-packages/sage/structure/sequence.py",
line 300, in Sequence
return Sequence_generic(x, universe, check, immutable, cr, cr_str,
use_sage_types)
File
"/home/thyagarajulu/Sage/local/lib/python2.7/site-packages/sage/structure/sequence.py",
line 504, in __init__
x = [universe(t) for t in x]
File
"/home/thyagarajulu/Sage/local/lib/python2.7/site-packages/sympy/core/symbol.py",
line 77, in __new__
return Symbol.__xnew_cached_(cls, name, **assumptions)
File
"/home/thyagarajulu/Sage/local/lib/python2.7/site-packages/sympy/core/cache.py",
line 93, in wrapper
r = func(*args, **kw_args)
File
"/home/thyagarajulu/Sage/local/lib/python2.7/site-packages/sympy/core/symbol.py",
line 81, in __new_stage2__
raise TypeError("name should be a string, not %s" % repr(type(name)))
TypeError: name should be a string, not <class 'sympy.core.symbol.Symbol'>
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