code: static int indexOfBinary(final double[] incr, final double v) {
  		int imin = 0;
  		int imax = incr.length;
  		int index = -1;
  
  		while (imax > imin && index == -1) {
  			final int imid = (imin + imax) >>> 1;
  
  			if (imid == 0 || (incr[imid] >= v && incr[imid - 1] < v)) {
  				index = imid;
  			} else if (incr[imid] <= v) {
  				imin = imid + 1;
  			} else if (incr[imid] > v) {
  				imax = imid;
  			}
  		}
  
  		return index;
  	}
docs: Perform a binary-search on the summed probability array.