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Ansoft Designer / Ansys Designer 在线帮助文档：

Nexxim Simulator >
Nexxim Transient Analysis >
   Transient Analysis Technical Notes >
       Numerical Integration Methods >
           Numerical Differentiation Formula

Numerical Differentiation Formula

The Nexxim simulator offers a proprietary variable-step integration method called the Numerical Differentiation Formula (NDF2). NDF2 offers nearly the accuracy of the trapezoidal method. It creates less numerical damping than BDF2, but like BDF2 it is an A-stable method.

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