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Re: Why no Import command?

• To: mathgroup at smc.vnet.net
• Subject: [mg127521] Re: Why no Import command?
• From: David Bailey <dave at removedbailey.co.uk>
• Date: Thu, 2 Aug 2012 04:47:21 -0400 (EDT)
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On 01/08/2012 09:55, Nicholas Kormanik wrote:
> Please see page:
>
> http://reference.wolfram.com/mathematica/ref/SmoothDensityHistogram.html
>
> Under Applications.  OldFaithful.mtp  Example file comes with Mathematica.
>
> SmoothDensityHistogram[ExampleData[{"Statistics", "OldFaithful"}],
> FrameLabel ->  {"Duration (minutes)", "Interval (minutes)"}, PlotLabel ->
> "Old Faithful Eruptions"]
>
> Why is no "Import" command needed?
>
> Also, how does Mathematica know which variables to use in the plot?

If you extract the inside of this expression, and execute it:

ExampleData[{"Statistics", "OldFaithful"}]

You will see that it returns an array of pairs of data corresponding to 
the requested data. The ExampleData function simply extracts data from a 
database accessible to Mathematica.

In general, if you don't understand how an expression works, take it to 
bits and see what the bits do!

David Bailey
http://www.dbaileyconsultancy.co.uk