共查询到17条相似文献,搜索用时 171 毫秒
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利用定义和不等式的放缩给出广义Nekrasov矩阵的一组充分条件,改进和推广了已有相关结果,并用数值实例说明了所得结果的有效性。 相似文献
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证明矩阵为广义Nekrasov矩阵的充要条件,给出判定矩阵不是广义Nekrasov矩阵的迭代算法,从而使得对广义Nekrasov矩阵的判定问题在实际应用中更加简捷而有效. 相似文献
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对角占优矩阵、M-矩阵、H-矩阵是一类应用范围很广的特殊矩阵,它们在计算数学、经济学、控制理论等领域中都有重要应用.文中给出了判定广义严格对角占优矩阵的若干充分条件,总结了已有的结果,并给出数值算例说明其有效性. 相似文献
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本文利用迭代算法和矩阵指标集的一个自由划分给出了广义严格对角占优矩阵的几个新的判据,改进和推广了一些相关结果,并用数值例子说明了结论的有效性。 相似文献
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给出了弱广义对角占优矩阵必有对角占优行这一结论,并证明当弱广义对角占优矩阵为不可约时,该结果还可以有更好的改进. 相似文献
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王峰 《温州大学学报(社会科学版)》2008,(3):18-21
给出了几个新的判定复方阵为广义对角占优矩阵和复方阵的比较矩阵为非奇肘一矩阵的充分条件.同时,也得到了非广义对角占优矩阵的判定方法. 相似文献
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利用α-对角占优矩阵的一些性质,获得了广义块严格对角占优季矩阵的几个判定定理,并给出数值例子来说明所得结果的有效性. 相似文献
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张华珍 《荆门职业技术学院学报》2010,25(5):39-43
文章讨论子矩阵约束下‖AX-Z‖2+‖YHA-WH‖2=min的广义中心对称解及其最佳逼近,给出了解存在的充要条件及通解的表达式,并且给出了解集合中与给定矩阵的最佳逼近。 相似文献
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Neil Sheldon 《Teaching Statistics》2004,26(1):24-25
This article defines the generalized mean and shows how it relates to such statistics as the arithmetic, geometric and harmonic means. 相似文献
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Sixty-seven participants (39 men and 28 women), ranging in age from 26 to 79 years, were administered Raven's Advanced Progressive Matrices (APM) on three occasions. Although total APM scores were found to be highly reliable across the three occasions, the reliabilities of most individual items were extremely low. A single-factor model remained a borderline adequate fit (explaining approximately 20% of the variance) for the interitem correlation matrix on all three occasions. Total APM scores increased significantly across the three occasions (approximately two items per occasion). Improvements in total score across the occasions happened within a context of subjects changing both correct and incorrect responses from the previous occasion. The number of items left unanswered was found to be unrelated to both APM score on any given occasion and the amount of gain in score made across occasions. These findings suggest that the improvements in performance were not based on the acquisition of a strategy design to respond to more items or on the retention of item-specific information, but rather, the improvement reflected learning, something common to the types of items found in the APM. 相似文献
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