This paper describes numerical difference methods for generating derivative spectra.
本文采用数值差分法计算产生各阶导数光谱值。
The relation between noncentral difference quotients convergence and derivative was discussed by drawing the concept of noncentral difference quotients convergence in this paper.
引入非中心差商极限概念，讨论了非中心差商极限存在与可导的关系，以及对称导数在研究函数性质方面的一些应。
Thie relationship between divided difference and derivative of a function can be generalized for two functions which the knots are distinct or the knots are coincident.
在结点互异或结点重合时，将函数差商与其导数之间的关系式推广为关于两个函数的情形。
In this paper the models, methods and algorithm of minimum risk of price difference in the derivative security market are discussed.
本文讨论了跨期套利交易的价差风险极小化模型、方法和算法。
The detection algorithm that adopts tow-level finite difference and extremal theory is used to locate the R wave and the one-level and tow-level derivative methods is used when detect QRS wave.
对于R波，采用二级差分和极值方法定位，对QRS波群采用一阶导数与二阶导数并用算法进行检测。
On the basis of Newton method, Secant method used the difference quotient instead of calculating the value of derivative. his thesis derives improvements of Newton method.
弦截法在牛顿法的基础上，利用差商来回避导数值的计算。本文推导了牛顿迭代法的各种改进方法。
FDM replace the derivative in control equation with difference formula, and then solve the equation with iterative method, which is simple, intuitionistic and easy to master.
有限差分法利用网格节点的差分公式取代控制方程中的各阶导数，然后利用迭代方法求解差分方程，该方法简单、直观且易于掌握。
The difference coefficient was used to replace the exact derivative which is difficult to be computed, and a new algorithm was presented by using the idea of reduced gradient method.
利用差商代替难以计算的精确导数，结合既约梯度法的思想建立新的算法；在目标函数一致凸的条件下证明了既约差商法的整体收敛性。
The difference coefficient was used to replace the exact derivative which is difficult to be computed, and a new algorithm was presented by using the idea of reduced gradient method.
利用差商代替难以计算的精确导数，结合既约梯度法的思想建立新的算法；在目标函数一致凸的条件下证明了既约差商法的整体收敛性。
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