diffusion coefficient function的用法和樣例：
例句
- The coefficient functions of the hyperbolic equations considered are assumed to be piecewise constant.
我們假設在所考慮的微分方程中，係數函數為片段常函數。 - A global smoothing method based on polynomial splines is used to estimate the coefficient functions in functional-coefficient linear autoregressive models.
摘要基於多項式樣條全局光滑方法，建立函數係數線性自回歸模型中係數函數的樣條估計。
