Least square method
linefit() can solve the system of equations with the least square method.
| A | |
| 1 | [[1,-2, 3],[2,3,4],[3,5,7]] |
| 2 | [-10,5,7] |
| 3 | =linefit(A1,A2) |
A1 Input the coefficient matrix
A2 Input Y
A3 Solve the equations, return
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