Example usage for org.apache.commons.math.analysis.polynomials PolynomialFunctionLagrangeForm PolynomialFunctionLagrangeForm

Introduction

In this page you can find the example usage for org.apache.commons.math.analysis.polynomials PolynomialFunctionLagrangeForm PolynomialFunctionLagrangeForm.

Prototype

public PolynomialFunctionLagrangeForm(double x[], double y[]) throws IllegalArgumentException 

Source Link

Document

Construct a Lagrange polynomial with the given abscissas and function values.

Usage

From source file:com.opengamma.analytics.math.util.wrapper.CommonsMathWrapperTest.java

@Test
public void testLagrange() {
    final int n = OG_POLYNOMIAL.getCoefficients().length;
    final double[] x = new double[n];
    final double[] y = new double[n];
    for (int i = 0; i < n; i++) {
        x[i] = i;//from  w w w  . ja  v a2  s  .  c  om
        y[i] = OG_POLYNOMIAL.evaluate(x[i]);
    }
    final Function1D<Double, Double> unwrapped = CommonsMathWrapper
            .unwrap(new PolynomialFunctionLagrangeForm(x, y));
    for (int i = 0; i < 100; i++) {
        assertEquals(unwrapped.evaluate(i + 0.5), OG_POLYNOMIAL.evaluate(i + 0.5), 1e-9);
    }
}

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