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aaron7

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[求助] 一个log-det-sum-exp-matrix函数的凸性研究问题

请问附件里这个f(X1,X2...XN)函数是凸的吗?Xi是厄米特正定矩阵
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aaron7

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2楼: Originally posted by acmuser at 2012-05-17 18:51:28:
interesting question, I will think about it when I have time.

A1=rand(2,2)+i*rand(2,2)
A2=rand(2,2)+i*rand(2,2)
A1=A1*A1'
A2=A2*A2'
B1=rand(2,2)+i*rand(2,2)
B2=rand(2,2)+i*rand(2,2)
B1=B1*B1'
B2=B2*B2'
t=0.3
a1=t*A1+(1-t)*B1
a2=t*A2+(1-t)*B2
ans1=log2(det(expm(a1)+expm(a2)))
ans2=t*log2(det(expm(A1)+expm(A2)))+(1-t)*log2(det(expm(B1)+expm(B2)))
这是仿真代码
4楼2012-05-18 09:38:56
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acmuser

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interesting question, I will think about it when I have time.
2楼2012-05-17 18:51:28
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aaron7

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引用回帖:
2楼: Originally posted by acmuser at 2012-05-17 18:51:28:
interesting question, I will think about it when I have time.

呵呵 谢谢关注
3楼2012-05-18 09:03:16
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acmuser

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你这里凸函数的定义是常见的那种吗?即f(tu+(1-t)v)>=tf(u)+(1-t)f(v)?
5楼2012-05-20 00:52:13
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