Let A = XYT, where X is an m r matrix, YT is an r
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B = Y (YTY)-1(XTX)-1 XT satisfies the Penrose conditions and hence must equal A+. Thus A+ can be determined from any factorization of this form.
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1 ABA XY T Y Y T Y 1 X T X 1 X T XY T XY T Y Y T Y 1 ...View the full answer
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