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1 question from Dimensionality Reduction

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Question 1: Short answer

easyAI-checkedDimensionality Reduction

What is the Frobenius-norm error ∥A−A1∥F\lVert A - A_1 \rVert_F of the best rank-1 approximation A1A_1 of A=diag(3,2,1)A = \mathrm{diag}(3, 2, 1)?

a number, 3 decimals