ModFit/Cubic.java at master · guruscott-meyer/ModFit · GitHub

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public class Cubic extends Formula
   {

   public Cubic( double[] params )
      {
      super( params );
      }

   public Cubic( Double[] x, Double[] y )
      {
      super( backSolve( new double[][] {
             { x.length, sigma( x ), sigma( x, 2.0 ), sigma( x, 3.0 ), sigma( y ) },
             { sigma( x ), sigma( x, 2.0 ), sigma( x, 3.0 ), sigma( x, 4.0 ), sigma( x, y ) },
	     { sigma( x, 2.0 ), sigma( x, 3.0 ), sigma( x, 4.0 ), sigma( x, 5.0 ), sigma( x, y, 2.0 ) },
	     { sigma( x, 3.0 ), sigma( x, 4.0 ), sigma( x, 5.0 ), sigma( x, 6.0 ), sigma( x, y, 3.0 ) } } ) );
      }

   public double getY( double x )
      {
      return Params[0] + Params[1] * x + Params[2] * x * x + Params[3] * x * x * x;
      }

   }