• Setting Up Mathematica Packages
• Creating Mathematica packages
• Custom package development: Basic steps
• How to make a package in Mathematica

Yes indeed Gustavo. Or one could extend the way I create the package notebook in my tutorial to include a Docked Cell with a button that does this (and which clears out the package context first before re-executing the package's initialization cells). In addition to that one could add additional buttons to take care of other package programming tasks in the notebook. In this old thing of mine (which I wrote back in Mathematica Version 5, but which I still use daily) there are a bunch of buttons (in a palette) which take care of such tasks: http://scientificarts.com/worklife/

Hi,nice tutorial,I was wondering is there a place where we can share packages among us?

Mikel, If you will read my tutorial you will see how to name your packages and have access to them. I don't feel like reproducing all of it right here. But also you will have to include the second argument in the BeginPackage statement that declares subsidiary packages that are needed in a tree structure - as David Reiss advises.

There is a way to divide an application into subpackages that all have the same Context and that call routines from each other, criss-cross. You don't have to use a tree structure. Essentially you break each subpackage into two files - a Public file that declares the exported names and a dummy Private section, and a second Private file with no public exported names. Then in the init.m file that launches the application all the Public files are read first and then afterwards all the Private files are read. Various other initiations can also be done in the init.m file. The Private routines then know all the names and can use them in the private code. I've used this in the GrassmannCalculus application without any problem.

David, Sorry because It is true that I have not explained very well and there are some errors in my example. I have develop routines within a Mathematica(10.2.0.0 version) notebook and now, I need to put them in two packages. In one package, I put a numerical integration method and in the second package, I write an ordinary differential equations of the problem.
I have put the packages your $UserBaseDirectory/Applications folder. RKG function (method) call DoublePendulumODE but I think Mathematica do not find it.

(Method)

BeginPackage["RKG`"];        
RKG::usage="Implicit Runge-Kutta integration of odefun.";
Begin["`Private`"];
RKG[ s_,u0_,e0_,t0_,tf_,n_,odefun_,parms_,opts___]:=
....]
End[ ];
EndPackage[];

(Problem)

BeginPackage["DoublePendulum`"];    
DoublePendulumODE::usage=" ";  
Begin["`Private`"];
DoublePendulumODE[t_,u_,parameters_List]:=
...]
 End[ ];
EndPackage[];

(* Notebook*)

Needs ["RKG`"];
Needs ["DoublePendulum`"];
....
RKG[s, u0, e00, T0, Tfinal, n, DoublePendulumODE, parameters)

I have one doubt about packages. I have implement two packages where package1 call a function which is defined in package2. Is correct the next implementation?

BeginPackage[["Package1"] myfunction::usage=""; Begin["Private"]; myfunction[x_]:= Module[{temp}, temp=fun1(x) End[]; EndPackage[]; ********************************************************* BeginPackage[["Package2"] fun1::usage=""; Begin["Private"]; fun1 Module[{temp}, temp=2*x: End[]; EndPackage[];