internal Bound(DoubleArray xValues, DoubleArray yValues) : base(xValues, yValues)
{
ArgChecker.isTrue(xValues.get(0) > 0d || xValues.get(xValues.size() - 1) < 0d, "xValues must have the same sign");
this.xValues = xValues.toArrayUnsafe();
this.yValues = yValues.toArrayUnsafe();
LinearInterpolator underlying = new LinearInterpolator();
this.poly = underlying.interpolate(xValues.toArray(), getProduct(this.xValues, this.yValues));
this.polySens = Suppliers.memoize(() => underlying.interpolateWithSensitivity(xValues.toArray(), getProduct(this.xValues, this.yValues)));
}