Question

你如何在C ++中执行二次二次拟合？拟合的等式具有以下形式：

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其中a，b，c，d，e和f是拟合参数。编写是否直截了当？是否有可以免费使用的库？

Answer 1

Use the matrix to get the values of a to f.

                [ x1^2  x1^2  x1^2  x1^2  x1^2  x1^2  ] = [ f(x1, y1) ]
                [ x1*y1 x2*y2 x3*y3 x4*y4 x5*y5 x6*y6 ] = [ f(x2, y2) ]
[a b c d e f] * [ y1^2  y2^2  y3^2  y4^2  y5^2  y6^2  ] = [ f(x3, y3) ]
                [ x1    x2    x3    x4    x5    x6    ] = [ f(x4, y4) ]
                [ y1    y2    y3    y4    y5    y6    ] = [ f(x5, y5) ]
                [ 1     1     1     1     1     1     ] = [ f(x6, y6) ]

[x] * [T] = [M]
=> [x] = [M] * inverse of [T]

如何在C ++中进行二次二次拟合？

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