/// <summary>
 /// Calculates the standard deviation of the elements along the specified axis.
 /// </summary>
 /// <param name="axis">The axis to operate along.</param>
 /// <param name="source">The NdArray containing the source values.</param>
 /// <param name="deltaDegreeOfFreedom">The delta degrees of freedom.</param>
 /// <returns>A new NdArray containing the result of this operation.</returns>
 public static NdArray <T> StdAxis(int axis, NdArray <T> source, T deltaDegreeOfFreedom)
 {
     return(NdArray <T> .Sqrt(VarAxis(axis, source, deltaDegreeOfFreedom)));
 }