Vectorial exprtk function arguments
Allow access of deformation_gradient, mechanical_strain, stress, total_strain, and total_stress in the exprtk expressions of the MPL Function property.
Because, if I understood the details of exprtk implementation correctly, exprtk needs pointers to data upon construction, one implementation for 2D case and another one for 3D case is provided.
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Edited by Dmitri Naumov