thanks for the quick reply
On Monday, February 9, 2015 at 10:41:26 PM UTC+5:30, Pedro Cruz wrote:
>
> With Sagemath:
>
> ┌────────────────────────────────────────────────────────────────────┐
> │ Sage Version 5.12, Release Date: 2013-10-07 │
> └────────────────────────────────────────────────────────────────────┘
>
> sage: var("d,e,f")
> (d, e, f)
> sage: A = matrix(SR, [ [1,2,3], [3,2,1], [1,1,1] ] )
> sage: w = vector(SR, [d,e,f] )
> sage: A*w
> (d + 2*e + 3*f, 3*d + 2*e + f, d + e + f)
> sage:
>
>
> Pedro
>
> On Monday, February 9, 2015 at 2:46:51 PM UTC, Thyagarajulu G wrote:
>>
>> #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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