VariationalD


returns the variational derivative of the integral with respect to , where the integrand f is a function of u, its derivatives, and x.


returns the variational derivative of the multiple integral with respect to , where f is a function of u, its derivatives, and the coordinates x, y, ... .


gives a list of variational derivatives with respect to u, v, ... .

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基本范例 (2)基本范例 (2)

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Variational derivative for the arc length of a plane curve:

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Variational derivative for the Dirichlet integral in two variables:

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