Alan Bromborsky wrote: > Scott wrote: > >> My integral has several pieces like this: >> >> int^x1_x0 int ^t0_t1 (dot(del_a(t)).T* R *b ) dt dx >> >> del_a is 3*1, b is 3*1 and R is 3*3 rotation tensor( or a non >> orthogonal velocity transformation tensor H) >> >> R,H and b are are constant over the interval of integration. >> R=H inv(H.T) >> >> My goal is to perform symbolic manipulations, plug in basis functions >> and do collections in del_a R b form while preserving the vector >> orientations. >> >> With del_a linear (C1) in time the answer should be: (x1-x0)(del_a >> (t1).T-del_a(t0).T)* R* b = scalar >> At this time all the pieces are added together and collected wrt the >> del terms yielding a nonlinear system. At this point the tensors are >> populated. >> >> On Dec 1, 3:28 pm, Scott<scotta_2...@yahoo.com> wrote: >> >> >>> Is there a sympy function for making symbolic tensors? >>> Basically I want to treat 3x3 rotation tensor symbol that is constant >>> inside of an integral while preserving the tensor algebra (A*B .ne. >>> B*A). The 3x3 rotain tensor is multiplied by a 3x1 position tenosr >>> which is integrated. >>> >>> Is there a built in function for converting a 3*1 tensor to a skew >>> antisymetric cross product matrix then back again? >>> V/R >>> >>> Scott >>> >>> >> -- >> >> 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. >> >> >> >> >> > Where is the position (x) dependence in the intergrand? > > -- > > 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. > > > > Also what is T?
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