quadratic trend surface
... quadratic trend surface 二次趋势面 Quadratic Surface Fitting 曲面拟合 hyperbolic quadratic surface 双曲型二次曲面 ...
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二次趋势面分析 secondary trend surface analysis
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将在地质方面常用的二元二次趋势面问题，推广到P元Q次超趋势面，并分析了其中的原理和计算方法。
P-variate Q-time hyper-trend surface method is derived on the basis of binary quadric hyper-trend surface method, and its algorithm and programming method are presented.
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