Dear support, In dolfin's demo of hyperelasticity/demo_hyperelasticity.py, when psi = (mu/2)*(Ic - 3) - mu*ln(J) + (lmbda/2)*(ln(J))**2 is swapped to psi = (lmbda/2)*(ln(J))**2 + (mu/2)*(Ic - 3) - mu*ln(J), it causes an error. Version is 1.4 for OS-X 10.9. Version 1.3 for OS-X 10.8 is all right. Could you check this ?
Best regards, Oka
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