Error thrown from Fit.Polynomial

@DRNadler wrote:

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 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](Matrix1 x, Vector1 y)
at MathNet.Numerics.LinearRegression.MultipleRegression.DirectMethod[T](Matrix1 x, Vector1 y, DirectRegressionMethod method)
at MathNet.Numerics.Fit.Polynomial(Double[] x, Double[] y, Int32 order, DirectRegressionMethod ..." string

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