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Re: Unloading packages


Sseziwa,

Firstly: to reload a package use Get not Needs (needs is designed not to
load already loaded packages.

You may still find that you get messages about symbols being protected  -
and these mean that you cannot make new definitions.

Two ways out of this

1....

At the end of the package between End[] and EndPackage[] you should find
some instructions like Protect[...]: comment these out thus
(*Protect[...]*).
(when you have finished revising remove (* and *).

2.... to do with package style:

After BeginPackage[...] insert in a new line
    Unprotect["`*"]
(I also add  ClearAll["`*"])
These will unprotect all the symbols in the package context and will clear
all definions and attributes associated with them.

Incidentally  instead of using Protect[ < sequence of symbols>] we can use
Protect["`*"]

There are cases where we need to refine the above, for example when dealing
with symbols from other contexts or when we do not want to protect some
symbols, but I find it very convenient.


--
Allan

---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565


"Sseziwa Mukasa" <mukasa at jeol.com> wrote in message
news:a2r4a3$9oj$1 at smc.vnet.net...
> Is is possible to unload packages or have the functions therein be
> reread from the source file every time the source changes?  I have a
> package that I am modifying and unfortunately I am introducing errors.
> When I fix the errors though I cannot reload the package so I have to
> quit and restart the kernel.  Hardly elegant by any measure.
>
> Thanks in advance,
>
> --
> Sseziwa Mukasa            Business phone  (direct) : (978) 536-2359
> JEOL USA INC                            (operator) : (978) 535-5900
> 1 Intercontinental Way
> Peabody, MA 01960         email: mukasa at jeol.com
> USA
>
>
>
>




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