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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