b***k 发帖数: 2673 | 1 ☆─────────────────────────────────────☆
anderg (anderg) 于 (Thu Oct 9 17:44:45 2008) 提到:
一个positive definite(PD)矩阵一定能分解成另一个PD矩阵的平方吗?
谢谢大家提示。
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cavaliere ( amo la salsa :) 于 (Thu Oct 9 18:12:37 2008) 提到:
sure
say A = Q^T * D * Q, where D is a diagonal matrix and Q is an orthogonal
matrix
Let B = Q^T * D^{1/2} * Q, then A = B^2
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anderg (anderg) 于 (Thu Oct 9 18:37:48 2008) 提到:
thanks!
i m dumb
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