Deformation gradient from points coordinates

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MarzioDG
MarzioDG 2017-7-19
Hello, I'm trying to evaluate the deformation gradient of a trasformation, as input I have only the points coordinates of the initial configuration and the final configuration. I tried to manually build the deformation gradient tensor evaluating the partial derivatives, but since I know only the value of the coordinates it's like if I try to derivate a costant so every partial derivative is zero. How can I do? I tried to use the function gradient, but right now it's not working cause maybe I'm making some mistakes. Thanks everybody.

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