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Re: writing tensor in mathematica

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131918] Re: writing tensor in mathematica
  • From: W Craig Carter <ccarter at MIT.EDU>
  • Date: Tue, 29 Oct 2013 02:51:18 -0400 (EDT)
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Dear Dhaneshwar,
I believe this may be what you are looking for:
avec = Array[a, 3]
bvec = Array[b, 3]
ctens = Array[c, {3, 3, 3, 3}]

ab[j_, k_] :=
 Sum[avec[[i]] ctens[[i, j, k, m]] bvec[[m]], {i, 1, 3}, {m, 1, 3}]

This may be enough to get you started, but there is also documentation for tensors (type tensor into the help browser) in the documentation.

Kind Regards,

W Craig Carter




On Oct 28, 13, at 20:22 PM, Dhaneshwar Mishra wrote:

> Hi
>
> I am Dhaneshwar Mishra, new to the Mathematica.
>
> I would like to write
>
> [ab]_(jk) = a_i [C_(ijkm)] b_m
>
> in the matrix form, where I,j,k, m varies from 1 to 3. Being a new user, I find
>
> little difficult to find proper help from the Mathematica documentations.
>
> Please suggest me appropriate reading materials so that I can take help of that as well.
>
> Thanks in advance.
>
> With regards
>
> Dhaneshwar
>




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