Load a function from a file
autoload (String_Type funct, String_Type file)
The autoload function is used to declare funct to the
interpreter and indicate that it should be loaded from file when
it is actually used.
Suppose bessel_j0 is a function defined in the file
bessel.sl. Then the statement
autoload ("bessel_j0", "bessel.sl");
will cause bessel.sl to be loaded prior to the execution of
bessel_j0
evalfile
file function