友阵逆特征值问题的递推法

本文主要讨论友阵的逆特征值问题，对于下文（0）式所示矩阵，任意给定n个数λ1，λ2，…，λn．使M以λi（i=1．2，…，n）为其特征值．     

矩阵方程的最小二乘解及其最佳逼近

利用矩阵的Kronecker乘积,给出了如下两类问题的解的一般形式,同时给出了矩阵方程ATXB-BTXTA=D有解的充分必要条件及有解时其解的一般表达式.问题1给定,,mpmnRBRApnmmRXRD,求使得min||||=--=FDAXBXBATTT.问题2给定XmnSXRX,~求使得XXXXXSX~min~-=-.其中SX是问题1的解集合.     

一类矩阵方程组的双对称解及其最佳逼近

建立了求矩阵方程组的双对称解的迭代算法.使用该方法不仅可以判断矩阵方程组是否有双对称解,而且在有双对称解时,还能够在有限步迭代计算之后得到矩阵方程组的双对称极小范数解.同时,也能够在矩阵方程组的对称解集合中求得给定矩阵的最佳逼近.     

线性流形上次对称矩阵的加权最小二乘解

通过矩阵的奇异值分解得到了线性流形上矩阵方程在加权范数下的最小二乘解,同时导出了解集合中与给定矩阵的加权最佳逼近解的表达式。     

线性流形上W准对称矩阵的加权最小二乘解

通过矩阵的奇异值分解得到了线性流形上W准对称矩阵在加权范数下的最小二乘解,同时导出了解集合中与给定矩阵的加权最佳逼近解的表达式．     

矩阵方程AX=B的循环解及其最佳逼近

文章首先考虑了如下问题：给定矩阵A,B∈Cn×m,求循环矩阵X∈CIRn×n,使得min｜｜AX—B｜｜。给X出了问题具有循环矩阵解的条件和解的一般表达式,若用SE表示上述问题解的集合,文章还考虑了最佳逼近问题：给定X＊∈CIRn×n,求X∈SE,使得minX∈SE｜｜X-X＊｜｜=｜｜X-X＊｜｜,其中｜｜·｜｜表示矩阵的Frobenius范XESE数,证明了问题存在唯一解,给出了其唯一解的一般表达式。     

友阵逆特征值问题的递推法

本文主要讨论友阵的逆特征值问题，对于下文（０）式所示矩阵，任意给定ｎ个数λ１，λ２，．．．．λｎ，使Ｍ以λｉ（ｉ＝１，２，３．．．，ｎ）为其特征值。     

矩阵指数的计算

首先给出了矩阵指数计算的一种通法,这里由矩阵的标准形理论得到e^λ=Te^jT-1．然后深入讨论了实n—l矩阵指数计算的待定系数法,即通过解方程组e^λi=∑＆n-1j=0bjλi^j（i=1,2,…,n）来确定bj（j=1,2,…,n=1）,从而得到e^A=∑^n-1j=0bjA^j.这里对[7]中在A的特征值互异时的情况分析作了改进,并对A存在重特征值时的情况作了补充     

一类矩阵广义特征值反问题解存在的充要条件

讨论了有关n阶对称正定矩阵A,B的广义特征值反问题Ax=λBx的可解性问题。在仅有部分特征值及特征值向量给定的假设下,提出了一个解存在的充分必要条件,并在理论上给出了证明。     

线性约束下广义中心对称矩阵扩充及其最佳逼近

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。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.