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how to get det(F) from displacement

To: dolfin-dev@xxxxxxxxxx
From: Chong Luo <luo.chong@xxxxxxxxx>
Date: Wed, 30 Sep 2009 07:14:38 -0700 (PDT)
Delivered-to: dolfin-dev@xxxxxxxxxx

Suppose I use fenics to solve incompressible elasticity, and get the displacement u. Now I want to check if the incompressibility is well satisfied, and want to plot the field (det(F)-1), where F = I+grad(u). Is there any way in fenics to do it?

Thank you!

Best,
Chong