[GiNaC-list] Differentiation of a function with respect to a tensor

[Vladimir V. Kisil]

		Dear Bernardo,

>>>>> On Wed, 9 Feb 2011 10:07:51 -0200, Bernardo Rocha <bernardosk at gmail.com> said:
    BMR> the strain energy function for the St. Venant-Kirchhoff
    BMR> material
    BMR> \Psi(E) = 0.5 * \lambda * (tr E)^2 + \mu E:E

	To start with, can you write this functions as a GiNaC expression?

	Best wishes,
	Vladimir
-- 
Vladimir V. Kisil     email: kisilv at maths.leeds.ac.uk
--                      www: http://www.maths.leeds.ac.uk/~kisilv/