How to use

solve

method

in

org.apache.commons.math3.analysis.solvers.BrentSolver

/**
 * Brent's algo Copied from AlgoRootInterval.java.
 */
public final static double calcSingleRoot(GeoFunction f, double left,
    double right) {
  BrentSolver rootFinder = new BrentSolver();
  if (!f.isDefined()) {
    return Double.NaN;
  }
  double root = Double.NaN;
  Function fun = f.getFunction();
  try {
    // Brent's method
    root = rootFinder.solve(AlgoRootNewton.MAX_ITERATIONS, fun, left,
        right);
  } catch (Exception e) {
    try {
      // Let's try again by searching for a valid domain first
      double[] borders = RealRootUtil.getDefinedInterval(fun, left,
          right);
      root = rootFinder.solve(AlgoRootNewton.MAX_ITERATIONS, fun,
          borders[0], borders[1]);
    } catch (Exception ex) {
      root = Double.NaN;
    } // try-catch
  } // try-catch
  return root;
}

rate = rootFinder.solve(AlgoRootNewton.MAX_ITERATIONS, fun, min,
    max);

root = rootFinder.solve(AlgoRootNewton.MAX_ITERATIONS, fun, min,
    max);
  root = rootFinder.solve(AlgoRootNewton.MAX_ITERATIONS, fun,
      borders[0],
      borders[1]);

root = rootFinderBrent.solve(MAX_ITERATIONS, fun, startX - step,
    startX + step,
    startX);
root = rootFinderBrent.solve(MAX_ITERATIONS, fun, borders[0],
    borders[1], startX);
if (checkRoot(fun, root)) {