查询词典 divided difference

Because the diffusive term is discretized with divided forward difference or divided backward difference according to the sign of convection velocity, these methods keep first order accuracy for diffusive term.

3.2考虑规则网格上的一维和二维定常型对流占优扩散问题，离散方法采用了有限体积方法及普通的有限差分方法，基本离散思想是将对流项提高到二阶精度，扩散项则根据对流速度的方向决定采用向前或向后差商离散。

Moreover it is very difficult to confirm the divided difference interval rightly.

自动微分是一种新的能精确而有效地计算导数的方法，它优越于传统的微分方法。

In the second chapter we first present a decomposition of divided difference operators on non-uniform knots.

在本文的第二章我们从差商算子分解的角度出发，首先给出差商算子的细分格式，然后进一步给出了非均匀B样条级数的细分算法。

This thesis presents the latest development of nonlinear filtering theory and the appliance of Divided Difference Filter, Unscented Kalmen Filter and Particle Filter in non-cooperative bistatic radar positioning and tracking system.

本文介绍了非线性滤波理论的最新进展，把DDF滤波器、UKF滤波器和PF滤波器应用到了非合作式双基雷达的定位跟踪中。

But for the middle and large scale problems, the computation cost by symbolic differentiation is very expensive. When the direction derivative is evaluated, the computation cost by divided difference can be reduced, but it is only one kind of approximate computation.

对于大中规模问题来说，使用符号微分，成本昂贵，有时甚至不可行，在计算导数的方向梯度时，利用差分法虽然可以降低计算成本，但得到的是近似值，而且确定恰当的差分区间也很困难。

Although some results on convex and concave iterative roots are known, there are no results about convexity for more general iterative equations. In this chapter, convexity of both increasing solutions and decreasing solutions is investigated by the divided difference theory and fixed point theory.

本章在连续函数构成的紧凸集上构造一个连续自映射算子，利用均差理论和不动点理论证明了线性型迭代方程的凹凸解的存在唯一性及连续依赖性。

Then,the second part is the basic facts about the numerical divided differenceand divided difference expansions, Then discussed the error bounds for the remainder term in Floater s divided difference expansions, and offers an pu...

第二部分是数值差商公式的基本概念，以及差商展开的思想；用初等的方法讨论了Floater中差商展开式的余项估计，|R_p|≤k~/k！

Moreover, we present a lattice path interpretation of the isobaric divided difference operators, and derive an expression for the flagged Schur function in terms of isobaric operators acting on a monomial.

并且，我们提供了齐次差分算子的一个格路径解释，从而证明了每一个带标志的Schur函数可以通过作用齐次算子序列在某个单项式上得到。

As we know,Newton's interpolation polynomial is based on divided differences which can be calculated recursively by the divided-difference scheme while Thiele's interpolating continued fractions are grared towards determining a rational function which can also be calculated recursively by so-called inverse differences.

大家都知道，牛顿的插值多项式是基于均差的，可以递归出均差，而Thiele插值连分式是一个有理插值，也可以递归地计算，即所谓的逆。

Stock shareholders, according to whether the name is written can be divided into bearer shares and bearer shares; according to the interests of shareholders and protection of difference can be divided into common stock and preferred stock; according to whether the amount can be divided into a nominal face value of stock and no-par value shares.

股票按是否写有股东姓名可分为记名股票与无记名股票；按股东的权益和保障的差异可分为普通股票与优先股票；按有无票面金额可分为有面值股票与无面值股票。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了