Example usage for org.apache.commons.math.analysis.solvers NewtonSolver solve

Introduction

In this page you can find the example usage for org.apache.commons.math.analysis.solvers NewtonSolver solve.

Prototype

@Deprecated
public double solve(final UnivariateRealFunction f, final double min, final double max, final double startValue)
        throws MaxIterationsExceededException, FunctionEvaluationException 

Source Link

Document

Find a zero near the value startValue.

Usage

From source file:cz.cuni.mff.d3s.spl.example.newton.app.Main.java

public static void main(String[] args) {
    try {/*from w  w  w  . ja v  a2s  .c  o  m*/
        System.out.printf("Letting things settle down before actual computation.\n");
        Thread.sleep(1000 * 1);
    } catch (InterruptedException ignored) {
    }

    /* This seed gives reasonable data, keep it at that ;-). */
    Random random = new Random(2);
    double[] coefficients = generateCoefficients(random);

    PolynomialFunction function = new PolynomialFunction(coefficients);
    NewtonSolver solver = new NewtonSolver();

    System.out.printf("Will solve polynomial function of degree %d.\n", function.degree());

    inspectClass(solver);

    try {
        for (int i = 0; i < WARM_UP_LOOPS; i++) {
            double result = solver.solve(10000, function, -1000, 1000);
        }

        long startTimeNanos = System.nanoTime();
        for (int i = 0; i < MEASURED_LOOPS; i++) {
            double result = solver.solve(10000, function, -1000, 1000);
        }
        long endTimeNanos = System.nanoTime();

        long runTimeNanos = endTimeNanos - startTimeNanos;
        long runTimeMillis = runTimeNanos / (1000 * 1000);

        System.out.printf("%d loops of solving took %dns (%dms).\n", MEASURED_LOOPS, runTimeNanos,
                runTimeMillis);
    } catch (MaxIterationsExceededException e) {
        e.printStackTrace();
    } catch (FunctionEvaluationException e) {
        e.printStackTrace();
    }

    inspectClass(solver);
}

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