Examples of com.nr.min.Bracketmethod.bracket()

com.nr.min.Bracketmethod.bracket()
Given a function or functor func, and given distinct initial points ax and bx, this routine searches in the downhill direction (defined by the function as evaluated at the initial points) and returns new points ax, bx, cx that bracket a minimum of the function. Also returned are the function values at the three points, fa, fb, and fc. @param a @param b @param func

    Ran myran=new Ran(17);
    Bracketmethod br = new Bracketmethod();
    for (i=0;i<N;i++) {
      a=50.0*myran.doub();
      b=a+span;
      br.bracket(a,b,this);
//      System.out.printf(br.ax << " " << br.bx << " " << br.cx);
//      System.out.printf(br.fa << " " << br.fb << " " << br.fc << endl);
      localflag = localflag || (br.fa < br.fb) || (br.fc < br.fb);
    }
    globalflag = globalflag || localflag;

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    double sbeps=3.e-16;
    for (i=0;i<N;i++) {
      a=50.0*myran.doub();
      b=a+span;
      br.bracket(a,b,this);
      localflag = localflag || abs(br.fa - funk(br.ax))>sbeps 
        || abs(br.fb - funk(br.bx))>sbeps
        || abs(br.fc - funk(br.cx))>sbeps;
    }
    globalflag = globalflag || localflag;

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