逼近

In this paper a few popular computation methods of matrix exponential are reviewed systematically and evaluated in detaA and some problems which need our thorough research are put forward.

本文系统地阐述了目前流行的几种主要逼近算法，对这些算法进行了详细的评估，并提出了一些有待深入研究的问题。

According to statistics, unmarried population in Taiwan approaches 6.7 million.

据统计，台湾地区未婚的单身人口逼近670万人。

However, a great lot of fuzzy rules are needed to approximate a complex nonlinear system, which can lead to a great lot of LMIs related to the number of fuzzy rules. In this case, positive definite matrix P might not exist.

可是，当需要大量的模糊规则来逼近一个复杂的非线性系统时，就导出与模糊规则数有关的大量LMIs，这可能会导致正定矩阵P不存在。

Based on the special decomposition of Hankel matrix, we can transform the problem of approximating a given matrix with a positive semidefinite real Hankel matrix of lower rank to a smooth unconstrained optimization problem.

对矩阵的低秩Hankel半正定矩阵逼近，采用特殊的分解形式，可将其转化为一个无约束的优化问题进行求解，本文应用拟牛顿方法求解无约束优化问题。

The state posterior probability distribution resolved by theKalman filter is not approaching resolution.

通过Kalman滤波器求解出的状态后验概率分布是解析解，而不是近似逼近值。

The recently developed particle filtering technology provides a general framework for nonlinear problem, and posterior state distribution is approximated by weighted particles which are generated through Monte Carlo simulation.

近年来迅速发展起来的粒子滤波技术为求解非线性问题提供了通用的框架，它通过Monte Carlo仿真产生的带权粒子来对状态分布进行逼近。

The infinite-dimensional inference technique was available to precisely approximate the posterior distribution of the noise.

提出一新的非参数贝叶斯推理算法来辨识任意复杂的多模噪声分布，采用无穷维推理技术，能够较为精确地逼近噪声的后验分布。

We prove the con-vergence of this method using potential theory and discuss the approxima-tion of finite dimension space.

利用位势理论证明了该方法的收敛性，并讨论了有限维空间的逼近，为数值计算提供了理论依据。

A ridge of high pressure is approaching from the Atlantic and will bring sunny wheather.

来自大西洋的高压脊正在逼近，将会带来阳光充足的天气。

For the regularized method, one can build the interface equation of the multiplier directly by eliminating the primal variable.

我们在文中对两种实用的情况得到了相应的逼近解的最优误差估计。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。