Use package "Calculus`VectorAnalysis`" ?

Questions
1

I am trying to:

Needs["Calculus``VectorAnalysis`"]

But it Failed and the error messages say:

Cannot open Calculus’VectorAnalysis’ and Context Calculus’VectorAnalysis’ was not created when Needs was evaluated. Does anyone know how I can get that package?

2

Packages like VectorAnalysis have had their functionality built into Mathematica since version 9.0 or so. What functions from the package do you need?

This reference page should get you started.

3

I think I have got what you are saying. Instead of calling Needs[“Calculus’VectorAnalysis’”], I can just use function CoordinateTransform[“Spherical” → “Cartesian”, {r0[#], [Theta][#], [Phi][#]}].

But when I am using the function EulerEquations[], I still need to call needs[“VariationalMethods`”], otherwise EulerEquations[] is not usable.

4

Okay, not all packages have been rolled into Mathematica. A list of those packages that currently still need to be loaded in is available at

VariationalMethods is indeed one of those.