查询词典 gradient method

The examples indicate that the algorithm has strong pertinence and high efficiency, hi the discrete variable optimization, the problem is solved in the relative quotient method On the base of analyzing the relative quotient method, the conjugate gradient direction is used to modify the old search directions, the iterative matrix of the algorithm, and the method to resolve the discrete variable optimization, the relative conjugate difference quotient algorithm is presented.

离散变量优化算法是从相对差商法开始的，在详细分析相对差上法的基础上，用共轭梯度方向修正原有的搜索方向，并对算法的迭代矩阵进行相关的修改，最终形成一种用于求解离散变量优化问题的RCDQ法。

General method, including steepest descent method, conjugate gradient method and Dynamic Programming, is t...

新型的智能仿生算法在动态优化问题中的应用也逐渐增多。

In the meantime, it can be seen that the conjugate gradient method or steepest descent method is a special case of the mixed method.

同时也可以看到共轭梯度法与最速下降法仅仅是混合算法的特例。

Based on the adequate study of general method to solve linear equation group, this thesis employs incomplete Cholesky conjugate gradient method for the numerical stability and efficiency of solution process. In order to eliminate morbidity of FEM coefficient matrix and speed up its convergency, this thesis proposes a newly effective incomplete Cholesky decomposition preconditioned method and suggests some improved preconditioned schemes to the current popular ICCG methods.

为了克服系数矩阵病态特性和加快收敛速度，本文从完全的Cholesky分解出发，构造出了一种新的不完全分解预处理方法，效果显著；另外，在已有的不完全Cholesky分解预处理方法的基础上，提出了十分有效的改进方案。

In order to analyse the structural reliability by stochastic finite element method rapidly and efficiently, a method combined with finite element method and gradient optimum algorithm based on ANSYS is presented when referring to the geometric interpretation of structural reliability index.

为快速、高效地进行基于随机有限元法的结构可靠度分析，从结构可靠性指标的几何意义出发，提出了在ANSYS平台上采用有限元法和梯度优化算法相结合的方法进行可靠度分析的构想，对ANSYS进行二次开发实现了该方法。

In Chapter 4, a symmetric triangular partitioned secant method for solving large scale sparse unconstrained optimization problems is constructed, which is a combination of a secant method and a finite difference method, and depends on a consistent partition of the columns of the lower triangular part of the Hessian matrix; it reduces the number of gradient evaluations required by Powell and Toints algorithm (the indirect lower triangular substitution algorithm) by one at every iterative step.

此算法是基于稀疏Hesse阵的下三角部分的列的相容分划的基础上建立起来的，把割线法和有限差分法有机的结合在了一起，在每次迭代中，把由Powell和Toint的算法所需要的梯度赋值次数减少了一。

Psychophysical experiments were carried out using both single stimulus method based on random-gradient method and one-interval-forced-choice method.

采用的心理物理学实验方法是单刺激随机阶梯法和单择一强迫选择法。

Based on analysis and comparison of the principle, method and form of train mass calculation and the correlative" select-judge value" for raising speed train,a change of particular attention from train mass to train speed is recommended in this paper,and the second critical gradient between the recommendatory maximum speed method and the traditional calculative speed method is established to the "select-judge value".

本文在分析与比较提速列车质量计算的原则和方式方法以及相关的选择判别值的基础上，提出应从传统的侧重列车质量的方式转向侧重运行速度的方式，并最终确立第二临界坡度为推荐的最高速度法与传统的计算速度法的选择判别值。

So it can be avoided that the computation accuracy is lowered and the calculation result is hard to be convergent for the odd state of transformation matrix.The computation accuracy of wavelet Ritz method and wavelet Galerkin method has been improved so the special'microscopic'property could be fully expressed. An effective method is offered also to solve the problem of high stress gradient and some other odd state problems in engineering.

从而避免了由于转换矩阵奇异而造成精度下降且计算结果不易收敛的问题，提升了小波Ritz法和小波Galerkin法的求解精度，使小波分析的"显微"特性得以充分发挥，并为应力大梯度问题和工程奇异问题的有效求解提供了强有力的计算手段。

The mixed method raise the convergent rate of the conjugate gradient method, and solve the problem which the steepest descent method can not solve in the condition with badly characteristics for the objective function.

混合算法既提高了共轭梯度算法的收敛速度，又解决了目标函数"性态不优"时，最速下降法难以求解的问题。

Continuously improve the production mechanism, to provide customers with better quality products and services.

不断的完善生产机制，给客户提供更优质的产品及服务。

B:Yes, he was the very prize-winner in the court tennis ten years ago?

是的，他是十年前的世界网球冠军。