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MathGroup Archive 2005

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Re: Re: usage messages in packages

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58092] Re: [mg58080] Re: usage messages in packages
  • From: Andrzej Kozlowski <andrzej at akikoz.net>
  • Date: Sat, 18 Jun 2005 06:07:45 -0400 (EDT)
  • References: <5D6FD070-7564-48DC-8311-25DC0738EFA4@akikoz.net> <d8u6ev$87s$1@smc.vnet.net> <200506171109.HAA25864@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Yes, I understand that. But my question was: if your have a directory  
DiscreteMath in your  AddOns/StandardPackages on  Unix (other than  
Mac OS X) will

<<discretemath`

still work for you?

Andrzej


On 17 Jun 2005, at 20:09, Jens-Peer Kuska wrote:

>
> Hi,
>
> at leaste MS-Windows is "case aware", what mean,
> it save upper
> and lower case characters but it does not make a
> difference between
> it.
>
> UNIX systems are typical "case sensitive" and the
> used upper and lower
> case characters make a difference.
>
> Regards
>   Jens
>
> "Andrzej Kozlowski" <akoz at mimuw.edu.pl> schrieb im
> Newsbeitrag news:d8u6ev$87s$1 at smc.vnet.net...
>
>> There are a couple of remarks I would like to
>> add to this posting.
>> First, I think it ought to be possible to modify
>> the usage message
>> mechanism so that usage messages about functions
>> that are being
>> overloaded would be appended to the existing
>> ones rather than
>> override them.
>> Secondly: I am wondering whether the ability to
>> read in packages with
>> both
>>
>> <<DiscreteMath`Combinatorica`
>>
>> and
>>
>> <<discretemath`combinatorica`
>>
>> is operating system dependent, i.e. whether both
>> of the above work on
>> OS's that distinguish between lower and upper
>> case names of files
>> and  directories. I think that means all
>> flavours of unix except Mac
>> OS X (?)
>> Can someone check this?
>>
>> Andrzej Kozlowski
>>
>>
>>
>>
>>
>> On 17 Jun 2005, at 08:04, Andrzej Kozlowski
>> wrote:
>>
>>
>>> One aspect of Mathematica packages that seems
>>> to me to be poorly
>>> designed is the way package usage messages can
>>> cover up a built in
>>> usage messages without any warning. A
>>> particularly irritating
>>> instance of this is when a package overloads
>>> the definition of a
>>> built in functions so that user receives no
>>> information at all
>>> about what happened. As an example compare:
>>>
>>>
>>> ?Normal
>>>
>>> Normal[expr] converts expr to a normal
>>> expression, from a
>>> variety of special forms.
>>>
>>> load the Combinatorica package:
>>>
>>>
>>> <<discretemath`combinatorica`
>>>
>>>
>>> ?Normal
>>>
>>> Normal is a value that options VertexStyle,
>>> EdgeStyle, and \
>>> PlotRange can take on in ShowGraph.
>>>
>>> Another curious thing. Quit the Kernel and now
>>> try again loading
>>> the Combinatorica package in a different way
>>>
>>> In[1]:=
>>> <<discretemath`
>>>
>>> This time the usage message was not covered up:
>>>
>>> In[2]:=
>>> ?Normal
>>>
>>> Normal[expr] converts expr to a normal
>>> expression, from a \
>>> variety of special forms.
>>>
>>> I had never realised that one could load
>>> directories of packages by
>>> using only small letters as in the above
>>> example until I saw Maxim
>>> doing it. This also works:
>>>
>>> << discretemath`combinatorica`
>>>
>>>
>>> Actually, this is consistent with the
>>> documentation which says:
>>>
>>>
>>>      <<dir` , initialize all packages from
>>> directory dir,
>>>      <<dir`package` , read in a package from
>>> the named directory
>>>
>>> but I had always assumed that "dir" and
>>> "package" actually meant
>>> "Dir" and "Package".
>>>
>>>
>>> Andrzej Kozlowski
>>> Chiba, Japan
>>> http://www.akikoz.net/andrzej/index.html
>>> http://www.mimuw.edu.pl/~akoz/
>>>
>>>
>>>
>>>
>>
>>
>
>
>


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