在给定分段节点横坐标的条件下，通过确定系数矩阵和反求曲线顶点，基于最小二乘法推导出最优节点的纵坐标公式。
The optimum knots ordinate formula in the least square sense is derived by computing coefficient matrix and curve vertexes under the specified subsection knots abscissas conditions.
比如，一些文章关注度上升的很快，到达顶点后急剧下降，形成一个尖锐突出的曲线。
Some stories, for example, spiked rapidly and then fell away, making a sharp, pointed shape.
曾听人说过：人生的价值是一条常态分布曲线，如果40岁是顶点的话，四十以前，金钱的价值高一些，四十以后，时间的价值越来越高了。
Had heard people speak: the value of life is a normal distribution curve, if the 40-year-old is a vertex, then 40 before the value of money higher, 40 after the value of time more and more high.
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