共查询到17条相似文献,搜索用时 78 毫秒
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针对有关“型”矩阵的三角分解问题 ,提出了一种 Toeplitz型矩阵的逆矩阵的快速三角分解算法 .首先假设给定 n阶非奇异矩阵 A,利用一组线性方程组的解 ,得到 A- 1的一个递推关系式 ,进而利用该关系式得到 A- 1的一种三角分解表达式 ,然后从 Toeplitz型矩阵的特殊结构出发 ,利用上述定理的结论 ,给出了Toeplitz型矩阵的逆矩阵的一种快速三角分解算法 ,算法所需运算量为 O( mn2 ) .最后 ,数值计算表明该算法的可靠性 . 相似文献
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本文对于Johnson、Austria提出的求解非线性方程组的基于矩阵三角分解修正的一类拟Newton法进行了改形,并给出了该算法的Kantorovich型的收敛性分析,从而完整了文(l]的收敛理论,亦为算法的初始选取,提供了依据. 相似文献
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根据r-对称循环矩阵的特殊结构给出了求这类矩阵本身及其逆矩阵三角分解的快速算法,算法的运算量均为O(n2),一般矩阵及逆矩阵三角分解的运算量均为O(n3). 相似文献
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三角形Toeplize矩阵的三角本原指数 总被引:1,自引:0,他引:1
讨论了三角形 Toeplize矩阵与一元多项式的关系以及非负三角形 Toeplize矩阵的三角本原指数 ,证明了 n阶非负上三角 Toeplize矩阵的三角本原指数集 Sn={1 ,2 ,… ,k-1 ,k,k1,k2 ,… ,ks,n-1 },其中 k是满足 k >4n -3 -12 和 n -1k +1 =n -1k 的最小整数 . 相似文献
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ARemarkontheInverseofPrincipalMatricesbyImplicitLUFactorizationHuangKaibinWuHebin(Dept.ofMath.,NanjingNormalUniversity,Nanji... 相似文献
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In this paper the accuracy of LU factorization of tridiagonal matrices without pivoting is considered. Two types of componentwise condition numbers for the L and U factors of tridiadonal matrices are presented and compared. One type is a condition number with respect to small relative perturbations of each entry of the matrix. The other type is a condition number with respect to small componentwise perturbations of the kind appearing in the backward error analysis of the usual algorithm for the LU factorization. We show that both condition numbers are of similar magnitude. This means that the algorithm is componentwise forward stable, i.e., the forward errors are of similar magnitude to those produced by a componentwise backward stable method. Moreover the presented condition numbers can be computed in O(n) flops, which allows to estimate with low cost the forward errors.
AMS subject classification (2000) 65F35, 65F50, 15A12, 15A23, 65G50.Received October 2003. Accepted August 2004. Communicated by Per Christian Hansen.Froilán M. Dopico: This research has been partially supported by the Ministerio de Ciencia y Tecnología of Spain through grants BFM2003-06335-C03-02 (M. I. Bueno) and BFM2000-0008 (F. M. Dopico). 相似文献
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一类广义范德蒙矩阵的求逆公式及递推公式 总被引:1,自引:0,他引:1
陆全 《数学的实践与认识》2004,34(7):132-135
利用线性方程组给出了一类广义范德蒙矩阵可逆的条件及逆矩阵的矩阵表示式 ,并给出了求逆的递推公式 . 相似文献
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利用对称内积的Schmidt正交化方法证明了各阶主子式不为零对称阵的LDLT分解.引入两个向量组关于弱内积广义正交的概念,并构造了将两组含相同个数向量的线性无关组化为广义正交组的广义Schmidt正交化方法.最后应用这一方法证明了各阶主子式不为零矩阵的LDU分解及一些相关的结果. 相似文献
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An efficient sparse LU factorization algorithm on popular shared memory multi-processors is presented. Pipelining parallelism is essential to achieve higher parallel efficiency and it is exploited with a left-right looking algorithm. No global barrier is used and a completely asynchronous scheduling scheme is one central point of the implementation. The algorithm has been successfully tested on SUN Enterprise, DEC AlphaServer, SGI Origin 2000 and Cray T90 and J90 parallel computers, delivering up to 2.3 GFlop/s on an eight processor DEC AlphaServer for medium-size semiconductor device simulations and structural engineering problems. 相似文献