On Sat, Dec 1, 2012 at 8:22 PM, Rishabh Dixit <rishabhdixi...@gmail.com> wrote: >>>> for i in range(10): > ... Sum(1/(ls[i]**ls[i]),(ls[i],1,oo)).evalf() > ... > >>>> solve([ls[0]+5*ls[1]-2,-3*ls[0]+6*ls[1]-15]) > {a0: -3, a1: 1}
Rishabh, basically the difference between what you are saying and I am saying is, in the first example above you are still using i as a name for Python builtin integer above and not a symbolic object and in the second example, you're not using any symbolic i at all. Python lists can take integer indices just fine. They can't take symbolic indices. Try: avals=list(symbols('a:10')) i=symbols('i',integer=True) print(summation(avals[i],(i,0,9))) and you will see what I am talking about. -- Shriramana Sharma -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sympy@googlegroups.com. To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.