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fsens(<control_variable>) evaluates the sensitivity (derivative) of the objective function with respect to the specified control variable. This result is available for all sensitivity methods. The result of fsens can be evaluated on the geometric entities where the control variable is defined. For a global control variable, fsens is available everywhere. In the same way, fsensimag(<control_variable>) evaluates the sensitivity (derivative) of the objective function with respect to the imaginary part of the specified control variable.
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sens(<dependent_variable>,<control_variable>) or sens(<dependent_variable>,<control_DOF>) evaluates the sensitivity (derivative) of the specified dependent variable with respect to the specified control variable degree of freedom. This is only possible when forward sensitivity has been used, which computes and stores derivatives of the entire solution vector with respect to each control variable degree of freedom.
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