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|| Ax+b ||^2 (2-norm) 要怎麼對A_ij 做微分呢? A is nxn dim-matrix x is nx1 dim-vector b is nx1 dim-vector 謝謝! -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.109.16.209