User talk:Wotao.yin

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Wotao

I regard the following as a difficult problem, having spent considerable time on it.

LaTeX: \begin{array}{cl}\mbox{minimize}_X&c^{\rm T}\mbox{vec}\,X\\ \mbox{subject to}&A\,\mbox{vec}\,X=b\\ &X^{\rm T\!}X=I\\ &X\geq_{}\mathbf{0}\end{array}

Vector LaTeX: c\, is left unspecified beause I may want to vary it later in a convex iteration. To start, it may be set to LaTeX: \mathbf{0} or LaTeX: \mathbf{1}. Rectangular matrix LaTeX: \,X\!\in\mathbb{R}^{1024\times256}\, comes from a square permutation matrix LaTeX: \Xi\, having three out of every consecutive four columns discarded.

--Dattorro 03:31, 5 November 2010 (PDT)

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