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MathGroup Archive 2005

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Re: Re: Re: Re: Bug in Import?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54882] Re: [mg54833] Re: [mg54797] Re: [mg54765] Re: Bug in Import?
  • From: Chris Chiasson <chris.chiasson at gmail.com>
  • Date: Sat, 5 Mar 2005 01:34:27 -0500 (EST)
  • References: <cvum3g$bmp$1@smc.vnet.net> <200503010658.BAA25162@smc.vnet.net>
  • Reply-to: Chris Chiasson <chris.chiasson at gmail.com>
  • Sender: owner-wri-mathgroup at wolfram.com

It seems like a lot of confusion happens because things are
undocumented or, more frequently, because people can't find the right
documentation in Mathematica help. Maybe we could add a documentation
section to that Mathematica wiki site? Maybe WRI should implement an actual
help search function? Maybe everyone should search the wolfram website
instead of the help file?


On Fri, 4 Mar 2005 05:07:32 -0500 (EST), Murray Eisenberg
<murray at math.umass.edu> wrote:
> _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
> 
> 


-- 
Chris Chiasson
Kettering University
Mechanical Engineering
Graduate Student
1 810 265 3161


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