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[Richard Norton <question102159@xxxxxxxxxxxxxxxxxxxxx>]

Question #102159 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/102159

    Status: Answered => Open

Richard Norton is still having a problem:
Sorry... in mathematical terms, sigma is a vector field from R^2 to R^2.
It maps (a,b) to (a,2(b^2-1)b) for real numbers a and b.   So yes,
sigma_1 and sigma_2 are the two components of sigma.  I want to define
an expression or function (called "sigma") so that the following code
makes sense...

# Test and trial functions
v = TestFunction(V)
u = TrialFunction(V)
uold = Function(V)

def sigma(gradu):
    ????
	
# Variational problem
a = dot(grad(u), grad(v))*dx
L = dot(sigma(grad(uold)),grad(v))*dx

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