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Y + = ( Y T Y ) -1 Y T

= Y Y + c. Y + = ( Y T Y ) -1 Y T. Inversion is possible if:. ?. . Y T Y is non-singular and squared. (Full rank). rank( Y ) = 2 =min(#r,#c) => Y is full rank. Y ’* Y is (3 3) but: rank( Y ’* Y )=2 !. 1. Y should have: #rows > #col.s. Column are linearly dependent. 2.

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