Hi all, After a discussion on IRC I am interested if there is any way to evaluate sums of the form:
>>> B = [ Symbols, expressions, ... ] >>> Sum(n*B[n]*Sqrt(B[n]), (n, 0, len(b)-1)) I ask because the project I am currently working on is based heavily around sums of this form: sum(sum(sum(sum(B[i]*A[i,j]*A[j,k]*A[k,l]*C[l],l,1,s),k,1,s),j,1,s),i,1,s) = 1/120 where s, A[i,j] (matrix) and C[i] (vector) are evaluate to Real numbers with just B[i] being Symbols (so the result of the above expression is an equation of the form x1*B[1] + x2*B[2] + ... + xn*B[n] with xn being Reals (of course in Python the indices would be slightly different). Can anyone think of a clean way to evaluate these sorts of sums? (Extra points if you know where such sums arise in practise ;) Currently my workflow is: 1) Use Python to generate the sums; 2) Evaluate using Maxima; 3) Paste back into a Python script, parse with regex, solve. Polemically yours, Freddie. -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sy...@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.
