I tried to fit a simple polynomial:

**polyFit = MathNet.Numerics.Fit.Polynomial(xSlope, yExpectedPRgap, 3);**

Input arrays are both double[3] and do work with a line fit as in:

**Tuple<double, double> PRcoeffs = MathNet.Numerics.Fit.Line(xSlope, yExpectedPRgap);**

Fit.Polynomial throws the exception below; what am I missing?

Thanks!

Best Regards, Dave

```
"Matrix dimensions must agree: 3x4." "Matrix dimensions must agree: 3x4." string
StackTrace " at MathNet.Numerics.LinearAlgebra.Double.Factorization.DenseQR.Create(DenseMatrix matrix, QRMethod method)
```

at MathNet.Numerics.LinearAlgebra.Double.DenseMatrix.QR(QRMethod method)

at MathNet.Numerics.LinearRegression.MultipleRegression.QR[T](Matrix`1 x, Vector`

1 y)

at MathNet.Numerics.LinearRegression.MultipleRegression.DirectMethod[T](Matrix`1 x, Vector`

1 y, DirectRegressionMethod method)

at MathNet.Numerics.Fit.Polynomial(Double[] x, Double[] y, Int32 order, DirectRegressionMethod …" string