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MathGroup Archive 2007

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Re: Re: What to do in v. 6 in place of Miscellaneous`RealOnly

  • To: mathgroup at smc.vnet.net
  • Subject: [mg77303] Re: [mg77088] Re: What to do in v. 6 in place of Miscellaneous`RealOnly
  • From: DrMajorBob <drmajorbob at bigfoot.com>
  • Date: Wed, 6 Jun 2007 07:23:46 -0400 (EDT)
  • References: <f33ork$l7l$1@smc.vnet.net> <f36go3$9rf$1@smc.vnet.net> <200705260842.EAA18740@smc.vnet.net> <200705270852.EAA03263@smc.vnet.net> <6063CBD7-7FB9-4719-90F7-DE917481A78E@earthlink.net> <f3gpr5$3m5$1@smc.vnet.net> <13878940.1181079094145.JavaMail.root@m35>
  • Reply-to: drmajorbob at bigfoot.com

Very cool.

And very dangerous.

Bobby

On Sun, 03 Jun 2007 05:09:35 -0500, Jean-Marc Gulliet  =

<jeanmarc.gulliet at gmail.com> wrote:

> Murray Eisenberg wrote:
>> Will such an Import handle correctly contexts from an "ordinary"  =

>> package?
>
> Yes. See at the bottom of the message for the location of a test packa=
ge
> and some Mathematica version 6.0 commands.
>
>> (The web server I use for most things is out of service at the moment=
,
>> so I cannot test that.)
>>
>>
>> Selwyn Hollis wrote:
>>> Apparently, it's now possible to load a package from a remote locati=
on
>>> on the web.
>>>
>>> I put a simple init.m file that defines a function HexToDecimal at t=
his
>>> url:
>>>
>>>         http://www.math.armstrong.edu/faculty/hollis/init.m
>>>
>>> Entering this quietly loads it:
>>>
>>>         Import["http://www.math.armstrong.edu/faculty/hollis/init.m"=
]
>>>
>>> For verification, enter this:
>>>
>>>     ?HexToDecimal
>>>
>>> Stunning.
>>>
>>>
>>> - Selwyn
>>>
>>>
>>> On May 27, 2007, at 4:52 AM, Murray Eisenberg wrote:
>>>
>>>> You've stumbled upon a long-standing problem I've faced with using
>>>> Mathematica in an academic setting (or perhaps any setting) where
>>>> systems are locked down by the folks whom maintain the systems: how=
 to
>>>> handle 3rd-party add-on packages.
>>>>
>>>> In my own experience, getting the packages installed on the student=
s'
>>>> own machines is not that big a deal provided the zip file (or  =

>>>> whatever)
>>>> is properly assembled and the instructions are sufficiently clear a=
nd
>>>> the students are able to follow direction.  (Hmm...the last IS a bi=
t  =

>>>> of
>>>> a problem: if only students read directions as carefully as I wrote=

>>>> them!)
>>>>
>>>> The real problem resides with lab & classroom computers. Given
>>>> sufficient advance notice, of course, such packages can be  =

>>>> incorporated
>>>> into the standard software on the systems. (At my own institution, =
any
>>>> package needed for the September semester needs to be in the hands =
of
>>>> the IT folks no later than July 1, and preferably earlier; for the
>>>> Spring semester, no later than Thanksgiving. This is a real pain.)
>>>>
>>>> I don't have a good solution to this.  Perhaps somebody at Wolfram
>>>> Research will look into it.
>>>>
>>>> Helen Read wrote:
>>>>> dimitris wrote:
>>>>>> Hi Helen.
>>>>>>
>>>>>> I don't have version 6 but in case you don't know
>>>>>> there is a much more flexible package named
>>>>>> SwitchableRealOnly by Ted Ersek available at
>>>>>>
>>>>>> http://library.wolfram.com/infocenter/MathSource/560/
>>>>> I'll have a look at that, but I'm not keen on using a package that=
  =

>>>>> the
>>>>> students would have to download and install themselves. (They use
>>>>> Mathematica on their own laptops and in computer labs all over  =

>>>>> campus,
>>>>> not just the classrooms maintained by the math department.)
>>>> --
>>>> Murray Eisenberg                     murray at math.umass.edu
>>>> Mathematics & Statistics Dept.
>>>> Lederle Graduate Research Tower      phone 413 549-1020 (H)
>>>> University of Massachusetts                413 545-2859 (W)
>>>> 710 North Pleasant Street            fax   413 545-1801
>>>> Amherst, MA 01003-9305
>>>>
>>
>
> I have put a test notebook at
>
> http://homepages.nyu.edu/~jmg336/mathematica/Sierpinski.m
>
> As you can see below, the context JMGTests`Sierpinski` is correctly
> created. Very cool feature indeed.
>
> In[1]:= $ContextPath
> Import["http://homepages.nyu.edu/~jmg336/mathematica/Sierpinski.m";]
> $ContextPath
> ?JMGTests`Sierpinski`*
> drawCarpet[4]
>
> Out[1]= {"PacletManager`", "WebServices`", "System`", "Global`"}
>
> Out[3]= {"JMGTests`Sierpinski`", "Utilities`URLTools`", "JLink`", \
> "PacletManager`", "WebServices`", "System`", "Global`"}
>
> drawCarpet[n] draws the Sierpinski's Carpet
>
> [graphic deleted]
>
> Regards,
> Jean-Marc
>
> P.S. Here is the code of the package. (Not breathtaking, for sure, but=

> it works well for illustrative purpose.)
>
> (* ::Package:: *)
>
> BeginPackage["JMGTests`Sierpinski`"]
>
> drawCarpet::usage="drawCarpet[n] draws the Sierpinski's Carpet"
>
> Begin["Private`"]
>
> rules = {0 -> {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}},
>      1 -> {{1, 1, 1}, {1, 0, 1}, {1, 1, 1}}};
>
> f[m_:1] := ArrayFlatten[m /. rules]
>
> drawCarpet[n_Integer?Positive] := MatrixPlot[Nest[f, 1, n], FrameTic=
ks
> -> None]
>
> End[]
>
> EndPackage[]
>
>



-- =

DrMajorBob at bigfoot.com


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