查询词典 ill conditioned

When to get the coefficients of polynomial directly,the ill-conditioned matrix may be produced and effect the precision of result.Using orthogonal polynomial can avoid this problem.This paper introduces 4 orthogonal polynomial.In our discussion,it is proposed to use Chebyshev polynomial and Legendre polynomial,they are easier to sa...

讨论4种常用正交多项式在拟合卫星轨道与时间函数时的适用性；通过计算实例说明利用切比雪夫多项式和勒让德多项式做数据拟合时具有很高的精度；分析得出评定多项式拟合数据精度的适用阶数，实际应用中可降低工作量，提高计算效率；最后讨论同一多项式阶数下不同历元数对拟合结果的影响。

The characteristics of the steepest descent method's small amount of computations and conjugate direction method's fast convergence combined, a conjugate vector base method for solving ill-conditioned linear equations was proposed.

结合最速下降法计算量小和共轭方向法收敛速度快的特点，提出了一种求解病态方程组的共轭向量基的方法。

If the Landweber method and pre-iteration method were convergent, the residue sequence would be monotone decreasing. By analyzing the convergence, the fact is demonstrated that for the severe ill-conditioned matrix of sensitivity coefficient, because of the limitation of the precision of the computer, the residue sequence is not monotone decreasing; thereby the reconstruction images diverge from the true distribution of the conductivity. So the generalized inverse method with threshold is established and the selection way of the regularization parameter is presented, by which the better images are reconstructed.

Landweber法和预迭代法收敛，则其残差序列单调递减，通过对它们的收敛性进行分析，证实对于病态性严重的灵敏度系数矩阵，由于受计算精度的限制，迭代过程中的残差序列不再单调递减，从而导致重建图象偏离实际电导率分布，因此作者建立了带阈值的广义逆算法，提出了规则化参数选择方法，获得了较好的图象重建质量。

In this paper, we construct the differential equation to solve the unconstrained optimization problem. Such methods solving the ill-conditioned problems are very effective. It indicates that the asymptotically stable region of explicit the Euler method to solve the differential equation equals to the descent region of the gradient method to solve the original unconstrained optimization problem.

我们发现，在用Euler方法求解二次优化问题的等价动力系统的方程时，由方法的步长确定的稳定区域对应于这些方法所得到的迭代公式的步长满足单调下降算法的条件确定的单调下降区域，因此我们可以利用这个性质构造解无约束优化问题的数值方法而不采用标准的常微分方程的数值求解公式。

In this paper, the grouting design and construction for the ill conditioned Liujiadong tunnel are simply introduced.

对清连一级公路六甲洞隧道病害整治注浆设计及注浆施工进行了简要介绍。

The convergence rate of PEDA-CONJ is sped up, and there is a good performance in ill conditioned mixture when applying PEDA-CONJ in BSS.

此算法应用到盲分离问题中，在混合矩阵严重病态情况下能取得了较好分离效果。

It can be demonstrated that two methods proposed in this paper, namely the method of selecting the additional parameters and the method of the rider estimation considering the parameters as weighted observations, ars of great importance to solving the ill—conditioned problem of the normal equati...

试验结果表明，本文研究的模型参数选择法和参数加权岭估计法对于解决法方程组的病态问题以及对于提高GPS双次差短弧法定位结果的精度和可靠性是很有意义的。

The resulting linear system, the coefficient matrix of which is, typically, a 2 x 2 block symmetric or non-symmetric and singular or non-singular indefinite matrix, is of high order and ill conditioned. In order to solve such system we have to use iterative methods with fast convergence speed.

所得的离散方程组（其系数矩阵典型地是 2 x 2 块对称或非对称，奇异或非奇异的不定矩阵）是高阶和病态的，为了求解这样的方程组我们必需使用快速收敛的迭代方法。

There are 30 413 reservoirs to be considered as ill conditioned and dangerous reservoirs according to "The method of identifying the safety of dam" by statistic analysis.

全国病险水库除险加固专项规划工作，自 1999年 7月启动到 2 0 0 1年 12月最终报告出版上报，历经两年多。

Reed, I presume, from after-occurrences, that the apothecary ventured to recommend my being sent to school; and the recommendation was no doubt readily enough adopted; for as Abbot said, in discussing the subject with Bessie when both sat sewing in the nursery one night, after I was in bed, and, as they thought, asleep,"Missis was, she dared say, glad enough to get rid of such a tiresome, ill- conditioned child, who always looked as if she were watching everybody, and scheming plots underhand."

艾博特说："我想太太一定巴不得摆脱这样一个既讨厌、品质又不好的孩子，她那样子就好像眼睛老盯着每个人，暗地里在搞什么阴谋似的。"

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。