Then an improved EVERETT interpolation formula in the form of polynomial of the variable is obtained by developing the differential form.

然后，将差分公式展开，得出了直接用自变量的多项式形式表示的改进的EVERETT插值公式。

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Using linear interpolation method, computing formula of vertical component of electric field on the metal surface is obtained. The stability conditions of the algorithm are brought up.

采用线性插值方法获得了导体表面法向电场的计算公式，给出了算法的稳定性条件。

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Also, the fitting formula of piecewise parabola interpolation is derived. The error evaluation based on ISO is accomplished for both experiential formula and parabola fitting formula.

导出了分段抛物线插值拟合公式，并对经验公式和抛物线拟合公式均以iso为基准进行了误差评估。

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