chronodm

import static java.lang.System.out;
import java.util.function.IntUnaryOperator;

/**
 * See https://softwareengineering.stackexchange.com/questions/376845/how-should-i-store-unknown-and-missing-values-in-a-variable-while-still-ret
 */
public abstract class Measurement {

  /**
   * Prints:

chronodm

import numpy as np
import math


# ############################################################
# unutbu's model() (https://stackoverflow.com/a/35118683/27358)

def model(params, xyz):
    a, b, c, d = params
    x, y, z = xyz