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MathGroup Archive 2005

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Re: Re: Re: Bug in Import?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54833] Re: [mg54797] Re: [mg54765] Re: Bug in Import?
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Fri, 4 Mar 2005 05:07:32 -0500 (EST)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <cvum3g$bmp$1@smc.vnet.net> <200503010658.BAA25162@smc.vnet.net> <200503020626.BAA08089@smc.vnet.net> <opsm0z49wuiz9bcq@monster.ma.dl.cox.net>
  • Reply-to: murray at math.umass.edu
  • Sender: owner-wri-mathgroup at wolfram.com

_I_ cannot discern what that behavior is; that's why the documentation 
would be desirable!  All I can really infer so far from the experiments 
is that .dat files are not, by default treated as text.

That the two records of the test .dat file give different results when 
imported with the default behavior may or may not be a bug.  I don't 
know what the format expected of a .dat file is.


DrBob wrote:
>>> Rather than a bug, the behavior originally cited would seem to
>>> be a failure of the documentation to describe the default behavior
>>> of Import when the file extension is ".dat".
> 
> 
> Then describe it, please, so this behavior makes sense.
> 
> Bobby
> 
> On Wed, 2 Mar 2005 01:26:43 -0500 (EST), Murray Eisenberg 
> <murray at math.umass.edu> wrote:
> 
>> Here's what I get:
>>
>>     $Version
>> 5.1 for Microsoft Windows (October 25, 2004)
>>
>>     Export["test.dat", {{"2005-01-24", "2005-02-14"},
>>     {"2005-01-24", "2005-02-14"}}];
>>
>>     Import["test.dat", "Text"] // InputForm
>> "2005-01-24   2005-02-14\n2005-01-24   2005-02-14"
>>
>>     Import["test.dat"]
>> {{"2005-01-24", "2005-02-14"}, {2005, -1, -24, 2005,
>>     -2, -14}}
>>
>> Rather than a bug, the behavior originally cited would seem to be a
>> failure of the documentation to describe the default behavior of Import
>> when the file extension is ".dat".
>>
>>
>> meznaric wrote:
>>
>>> Hm, this seems strange. I am using 4.1 and what happens is this:
>>>
>>> Export["R:\\test.dat",
>>> {{"2005-01-24", "2005-02-14"},
>>> { "2005-01-24", "2005-02-14"}}]
>>>
>>> Import["R:\\test.dat"]
>>> {{1980, 1989}, {1980, 1989}}
>>>
>>> !! R:\\test.dat
>>> 2005-01-24   2005-02-14
>>> 2005-01-24   2005-02-14
>>>
>>> In the Import case Mathematica seems to have actually evaluated those
>>> cells as if they hadn't been strings, but integers.
>>>
>>> In your case, it certainly seems to be a bug, though. How can two
>>> identical list parts be exported/imported in a different way?
>>>
>>> Regards,
>>> Sebastjan Meznaric
>>>
>>>
>>
> 
> 
> 

-- 
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


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