新手请教了，感谢支持。
我尝试着如下这样写，结果是4 + 2.5x + 4x^2 ，这显然是错误的，请高手指点，谢谢
Sub sad()
Dim X(4) As Double
Dim Y(4) As Double
X(0) = 0.0
X(1) = 1.0
X(2) = 2.0
X(3) = 3.0
X(4) = 4.0
Y(0) = 0.0
Y(1) = 0.15
Y(2) = 0.5
Y(3) = 2.0
Y(4) = 2.5
Dim res As New MathNet.Numerics.Polynomial(X(4), Y(4), 4, 0）
End Sub

mathnet文档中是这样写的：
Double[] Polynomial(Double[] x, Double[] y, int order, DirectRegressionMethod method)
Least-Squares fitting the points (x,y) to a k-order polynomial y : x -> p0 + p1*x + p2*x^2 +... + pk*x^k,returning its best fitting parameters as [p0, p1, p2,..., pk] array, compatible with Polynomial.Evaluate.A polynomial with order/degree k has (k+1) coefficients and thus requires at least (k+1) samples.