块三对角矩阵

With the LU decomposition of the block tridiagonal matrix, an explicit expression of the block inverse elements is obtained.

由块三对角矩阵的LU分解，得到了其逆矩阵块元素的显式表达式。

Tridiagonal block matrix elemination and sweep algorithm is successfully applied to solve the large matrix involved; central difference method is supplemented to Houbolt method to form a time integration method with estimation and correction, to solve the time integration of second order implicit non-linear equation; simplification of system equation by decoupling between the physical coordinates x and y further improves the calculation accuracy and speed.

其中：成功地引入块三对角矩阵追赶法求解上述问题构成的大型矩阵；提出中心差分法+Houbolt法的预估计—校正时间积分法，以解决二阶隐式非线性方程的时间积分问题；系统方程在物理坐标x和y上的"解耦"简化，使计算速度和计算精度得以进一步的提高。

The computing complexity and computing time of this algorithm is lower than that of existed algorithms.

该算法比已有的块三对角矩阵求逆算法的计算复杂度和计算时间低。

This new method reduces the computational complexity by using the block tridiagonal structure of the input sample correlation matrix, and at the same time keeps the advantage of fast convergence.

在保持了该算法快速收敛优点的同时，利用相关矩阵块三对角的特殊结构，降低了该算法的计算复杂度。

The result shows that the matrix in the final eigenvalue equations is three diagonal blocks matrix, so a great deal computer memory can be saved.

推导结果表明，最终得到的用于稳定临界载荷求解的特征方程中的矩阵为三对角块矩阵，从而可以节省大量的存储空间。

The third part is the judge method and its improvement method of a piece matrix is a diagonally dominant matrix: By using the Schur repair property of matrices, gives the sufficient and necessary conditions to judge a piece matrix be a diagonally dominant matrix.

第三部分为分块广义严格对角占优矩阵的判定方法及其改进：利用矩阵Schur补的性质，给出判定分块广义严格对角占优矩阵的充要条件，并利用逐次降阶的方法，使一个任意阶矩阵A逐次降为只需要利用定义判定一个矩阵是否满足要求，从而判定A是否是广义严格对角占优矩阵。

A parallel algorithm for certain real symmetric block-tridiagonal linear systems on distributed-memory multicomputers is proposed. This algorithm is based on the block factorization of the coefficient matrix. This algorithm is used to solving the block-tridiagonal linear systems resulted from the finite difference approximation to Poisson's equation with Dirichlet boundary conditions. Then we get a parallel algorithm which speedup tends to linear speedup.

7研究了一类实对称块三对角线性方程组的分布式并行求解，提出了一种基于块矩阵分解的高效分布式并行算法，将其应用于求解带Dirichlet边界条件的Poisson方程导出的块三对角线性方程组，得到加速比趋于线性加速比的分布式并行算法，理论上说，这也是并行算法的理想情况。

In this paper,new quadratic PEk method and quadratic EPEk method are given for solving a system of linear algebraic equations whose matrix of coefficients is tridiagonal blocked matrix.

建立求解系数矩阵为分块三对角矩阵的线性代数方程组的新型二次PEk方法以及其外插迭代二次EPEk方法，对系数矩阵为对称正定矩阵情形，证明了新型二次PEk方法和二次EPEk方法的可解性和收敛性

The reduced quasi-block tridiagonal matrix simultaneous correction algorithm based on LU decomposition is developed for interlinked distillation columns, which can successfully solve non-tridiagonal matrix caused by connecting stream or recycle stream of the column system.

提出了处理内联精馏塔系统的基于LU分解的压缩型拟块三对角矩阵方程组同时校正算法，解决了由于塔之间存在联接物流或回流而形成的非三对角矩阵方程的求解问题。

In depth wavefield migration, in order to extend the 2D implicit method to 3D case, a blocklike diagonal matrix has to be inverted.

在深度偏移方法中，把二维隐式方法推广到三维，就会面对一个分块对角矩阵求逆问题。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。