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diagonal of a tensor

To: UFL Mailing List <ufl@xxxxxxxxxxxxxxxxxxx>
From: Johan Hake <johan.hake@xxxxxxxxx>
Date: Wed, 2 Nov 2011 16:12:50 -0700
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Hello!

Is there an easy way to extract the diagonal of a square tensor in ufl? I know 
I can do:

  diag = as_vector([A[0][0], A[1][1]])

but it would make sense to have something like:

  diag(A), A.diag()

Johan

Follow ups

Re: diagonal of a tensor
From: Martin Sandve Alnæs, 2011-11-03