Automatic Loading of Packages
Previous sections have discussed explicit loading of Mathematica
packages using <<package
. Sometimes, however, you may want to set Mathematica
up so that it automatically loads a particular package when the package is needed.
You can use DeclarePackage
to give the names of symbols which are defined in a particular package. Then, when one of these symbols is actually used, Mathematica
will automatically load the package where the symbol is defined.
|declare that a package should automatically be loaded if a symbol with any of the names namei is used |
Arranging for automatic loading of packages.
When you first use Grad
automatically loads the package that defines it.
When you set up a large collection of Mathematica
packages, it is often a good idea to create an additional "names file" which contains a sequence of DeclarePackage
commands, specifying packages to load when particular names are used. Within a particular Mathematica
session, you then need to load explicitly only the names file. When you have done this, all the other packages will automatically be loaded if and when they are needed.
works by immediately creating symbols with the names you specify, but giving each of these symbols the special attribute Stub
. Whenever Mathematica
finds a symbol with the Stub
attribute, it automatically loads the package corresponding to the context of the symbol, in an attempt to find the definition of the symbol.