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Re: Best practices for loading packages

From: Helios de Rosario
Subject: Re: Best practices for loading packages
Date: Thu, 27 Mar 2014 14:56:02 +0100

>>> El día 27/03/2014 a las 12:38, Daniel Kraft
> Hi!
> I've recently started to appreciate what packages can do to keep
> structured in Octave.  Now I'm wondering what the "best practices"
> loading packages are.
> In particular, if I write a function "foo" that uses some package
> and then use the function itself from my main program.  What I'm
> currently doing in the main script is something like this:
>   clear ("all");
>   pkg load bar;
>   ... other things ...
>   foo ();
> What is the recommended way of handling this situation?  Just load
> packages in the main program?  Or is there a way to "ensure" that a
> package is loaded just for the scope of a function executing? 
> to #include of headers in some .cpp file or import directives in
> languages that only concern a "local" scope (one compilation unit).)

I don't think there is a straightforward way to do that. Packages work
globally within the scope of the session, more or less like Matlab's
toolboxes. If you want that your function "foo" using the package "bar",
without disturbing the rest of the session, what you may do is copy the
functions of "bar" in the "private" folder where "foo" resides.

That may do what you want if "bar" is only a bunch of functions ready
to use. If there are actions that should be executed when the package is
installed or loaded, it might not be that easy.

Helios De Rosario

Universidad Politécnica de Valencia • Edificio 9C
Camino de Vera s/n • 46022 VALENCIA (ESPAÑA)
Tel. +34 96 387 91 60 • Fax +34 96 387 91 69

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