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怎么能随机生成200个矩阵,且它们的特征值的绝对值都小于2

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abababa posted 2021-11-26 15:27 |Read mode
如题,这个用Mathematica要怎么做呢?

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hbghlyj posted 2025-1-18 23:44
关于最大的特征值:Perron–Frobenius theorem页面有很多资料。

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original poster abababa posted 2025-1-19 11:25
hbghlyj 发表于 2025-1-18 23:55
概率分布是什么呢
我都不记得当初弄这个要干什么了。

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hbghlyj posted 2025-1-19 21:58
abababa 发表于 2025-1-19 03:25
我都不记得当初弄这个要干什么了。
问一下,“$A$的特征值的绝对值都小于$2$”等价于“对于任意单位向量$v$,$v^TAv<2$.”吗

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hbghlyj posted 2025-1-19 22:03
hbghlyj 发表于 2025-1-19 13:58
特征值的绝对值都小于$2$”等价于“对于任意单位向量$v$,$v^TAv<2$.”吗 ...
这个是不是必须在$A$ Hermitian时($A^{\rm H}=A$)才成立呢?MSE

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