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MathGroup Archive 2006

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Re: "unload" a package

  • To: mathgroup at smc.vnet.net
  • Subject: [mg70829] Re: [mg70814] "unload" a package
  • From: "Chris Chiasson" <chris at chiasson.name>
  • Date: Sat, 28 Oct 2006 23:38:04 -0400 (EDT)
  • References: <200610280921.FAA16109@smc.vnet.net>

To be clear: I didn't make the other fourm (though I wish I had, so I
could have control). Also, Needs will not reload a package that
appears in $Packages, even if its definitions have been erased. You
may want to check to see what other packages are loaded by
Graphics`Graphics`.

On 10/28/06, dimitris <dimmechan at yahoo.com> wrote:
> Hello to all.
>
> I wondered how someone can "UNLOAD" a package
> without "kill" the Kernel?
>
> That is, is there a command that does the opposite of Get or Needs?
>
> After the Chriss Chiasson and David Park's responses (thanks a lot both
> of you!!!) and their suggestion for using Remove I tried to experiment
> myself, practise which resulted in a bigger query.
>
> Before proceeding to my question Copy/Paste the
> following in a notebook, select the Cells and execute the commands.
>
> ----------------------------------------------------------------------------------------------------------
>
> Print[StyleForm["Version I work", FontColor -> Blue, FontWeight ->
> "Bold"]]
> $Version
>
> Print[StyleForm["Load the package", FontColor -> Blue, FontWeight ->
> "Bold"]]
> Needs["Graphics`Graphics`"]
>
> Print[StyleForm["Built-in Symbols inside the package", FontColor ->
> Blue,
> FontWeight -> "Bold"]]
> Names["Graphics`Graphics`*"]
>
> Print[StyleForm["An example", FontColor -> Blue, FontWeight -> "Bold"]]
> DisplayTogether[Plot[x, {x, 1, 2}], Plot[2*x, {x, 1, 2}]];
>
> Print[StyleForm["Remove all the Built-in Symbols\nof the package from
> the Kernel", FontColor -> Blue, FontWeight -> "Bold"]]
> Remove["Graphics`Graphics`*"]
>
> Print[StyleForm["Check", FontColor -> Blue, FontWeight -> "Bold"]]
> Information["Graphics`Graphics`*", LongForm -> False]
>
> Print[StyleForm["Reload the package", FontColor -> Blue,
> FontWeight -> "Bold"]]
> Needs["Graphics`Graphics`"]
>
> Print[StyleForm["Built-in Symbols inside the package", FontColor ->
> Blue,
>  FontWeight -> "Bold"]]
> Names["Graphics`Graphics`*"]
> Print[StyleForm["!!!", FontColor -> Blue, FontWeight -> "Bold"]]
>
> Print[StyleForm["Kill the Kernel", FontColor -> Blue, FontWeight ->
> "Bold"]]
> Quit
>
> Print[StyleForm["Re-re-load the package (...)", FontColor -> Blue,
> FontWeight -> "Bold"]]
> Needs["Graphics`Graphics`"]
>
> Print[StyleForm["Built-in Symbols inside the package", FontColor ->
> Blue,
> FontWeight -> "Bold"]]
> Names["Graphics`Graphics`*"]
>
> Print[StyleForm["Kill the Kernel", FontColor -> Blue, FontWeight ->
> "Bold"]]
> Quit
>
> Print[StyleForm["Re-re-re-load the package (...)", FontColor -> Blue,
> FontWeight -> "Bold"]]
> Needs["Graphics`Graphics`"]
>
> Print[StyleForm["Built-in Symbols inside the package", FontColor ->
> Blue,
> FontWeight -> "Bold"]]
> Names["Graphics`Graphics`*"]
>
> Print[StyleForm["Clear all the Built-in Symbols\nof the package from
> the Kernel",
> FontColor -> Blue, FontWeight -> "Bold"]]
> Clear["Graphics`Graphics`*"]
>
> Print[StyleForm["Check I", FontColor -> Blue, FontWeight -> "Bold"]]
> Information["Graphics`Graphics`*", LongForm -> False]
>
> Print[StyleForm["Check II", FontColor -> Blue, FontWeight -> "Bold"]]
> DisplayTogether[Plot[x, {x, 1, 2}], Plot[2*x, {x, 1, 2}]]
>
> Print[StyleForm["Check III", FontColor -> Blue, FontWeight -> "Bold"]]
> Needs["Graphics`Graphics`"]
> Print[StyleForm["Again problem", FontColor -> Blue, FontWeight ->
> "Bold"]]
> DisplayTogether[Plot[x, {x, 1, 2}], Plot[2*x, {x, 1, 2}]]
>
> ---------------------------------------------------------------------------------------------------------------
>
> And here comes my question!
>
> Ok, with Remove["Graphics`Graphics`*"] you avoid to refresh the Kernel
> in order to "unload" (...somehow..) the package.
>
> However, in order to reload again the package you MUST refresh the
> Kernel!
> BUT, this is what I want to avoid!
>
> The same holds true, more or less, for Clear.
>
> Anyway for those that are interested in the subject,
> there is forum for Mathematica (I think Chris Chiasson is responsible
> for it; see http://groups.google.com/group/mathematica)
> and look what someone answered me:
>
> "I think that there is no reliable way to do this.
> However, take a look at the CleanSlate package in
> ExtraPackages/Utilities. The documentation is inside the CleanSlate.m
> file. But keep in mind that this package is not very reliable.
> You can also read about contexts. The functions imported from packages
> usually reside in their own context."
>
> What do you believe?
>
> I really appreciate any guidance/further insight.
> Thanks in advance for any response
>
> Dimitris Anagnostou
>
>


-- 
http://chris.chiasson.name/


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