正定矩阵

Further more, this thesis has provided a new method for optimizing sampling in theory, and established the probability model for the positive definitiveness of discrete sample by which the number of sampling was optimized.

在应用上，建立了离散型样本协方差矩阵正定的概率模型；提出了一种新的优化抽样调查设计方案，优化了抽样个数。

In the inversion of re- flection coefficient, t...

迭代反演反射系数时，对于过渡矩阵没有对称正定的限制，从而改善了算法的稳定性，同时减少计算量。

Lastly we consider the perturbation bound on Hermitian positive semidefinte factors for unitrary polar decomposition (see 5.1), whichimprove and extend the corresponding results in other papers.

第五章讨论了在矩阵酉极分解中Hermite半正定因子的扰动(见§5.1)，对以往的结果做了改进。

This paper presents a stability criterion for design iterative learning controller. From the criterion,one can change the design problem into finding a positive definite discrete matrix kernel. It has been shown that what kind of variable can be controlled by the iterative learning,(2) and what kind of filter can be included into the controller.

摘要提出了一种针对自学习控制的稳定性判据，应用这一稳定性判据将自学习控制器的设计转化为寻找正定离散矩阵核，从而回答了两个问题，其一什么样的量可以通过自学习叠代加以控制，其二学习叠代中什么样的滤波环节的引入不会影响学习收敛性。

If a symmetrical matrix is positive definite, the determinants of all its minors are also positive.

如果对称矩阵是为正定者，它的所有子式的行列式也都是正的。

In this paper, what happens to the inequality when the positive definite matrix is allowed to be positive semi-definite was considered.

本文进一步推广王松桂等的结论，对于半正定Hermite阵，给出了推广的Wielandt不等式的矩阵形式。

It is the conclusion that the algorithms are very effective in accuracy and can avoid the major defect of non—positive definite coefficent matrix of static analysis based on conventional mixed models.

这两种模型除具有很高的计算精度外，还避免了一般空间混合元静力分析中系数矩阵不正定的重要缺陷。

The sufficient condition of the existance and unigueness of solution is that the original main matrix is positive.

本文通过对这类数值计算问题的解的唯一性及存在性的讨论，表明了解存在且唯一的一个充分条件是原系数矩阵正定。

The symmetric positive semidefinite solutions of the matrix equation= is considered in this paper.

讨论了矩阵方程＝的对称半正定解。

If the step of the linear system question is not very high, direct solving method is better; if coefficient matrix of the linear system question is not regular and large-sparse matrix , direct solving method does not settle the storage question.

而在求解线性方程组的许多实际问题中，尤其在偏微分方程的差分方法与有限元方法求解问题之中，方程具有重要的特征，一是多为大型稀疏矩阵；二是满足一些条件如对称正定、对角占优等，这使迭代法得到广泛的应用。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。