/// <summary>
/// Returns the first axis value lower than this data value if the axis interval is the NumberSize() of this value.
/// </summary>
/// <param name="d"></param>
/// <returns></returns>
public static double AdjustDown(this double d)
{
return(d.AdjustDown(d.NumberSize()));
}
/// <summary>
/// The appropriate minimum axis value for this minimum data value.
/// </summary>
/// <param name="d"></param>
/// <returns></returns>
public static double FindMin(this double d)
{
double i = d.intervalForAdjust();
return(d.AdjustDown(i));
}