Suppose $A\in \mathbb R^{n\times n}$ and $D = \operatorname{diag}(d_1,...,d_n) \in \mathbb R^{n\times n}.$ Show how to construct an orthogonal matrix $Q$ such that: $$ Q^TA-DQ^T=R $$ is an upper triangular matrix. Do not worry about the efficiency.
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This is the raw text of your homework, without anything personal. Convince us that you have worked on it... – Jean Marie Feb 17 '20 at 15:43
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You should answer to the questions we ask; This site is based on dialog. – Jean Marie Feb 17 '20 at 16:29
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1Sorry to be late. I have tried but cannot find any useful method. – Jonas Lionel Feb 17 '20 at 17:39