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Matt J
Matt J 2018-7-5
Which b? You have two.
Matt J
Matt J 2018-7-5
编辑：Matt J 2018-7-5
Looks like your Vandermonde matrix is flipped left-to-right. Or your [a,b,c] vector is upside down.
Matt J
Matt J 2018-7-5
编辑：Matt J 2018-7-5
Note: instead of eliminating 'c', you could also just use lsqlin() with an equality constraint.

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Matt J
Matt J 2018-7-5

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Seems to me that B should equal y.

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