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Understanding Flatten

• To: mathgroup at smc.vnet.net
• Subject: [mg46314] Understanding Flatten
• From: Harold.Noffke at wpafb.af.mil (Harold Noffke)
• Date: Fri, 13 Feb 2004 21:58:11 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Mathematica 5.0.1 on Windows 2000
MathGroup:

In my study of Flatten, the Mathematica Book gives this example ...

	You can use Flatten to "splice" sequences of elements into lists
	or other expressions.  

	In[5]:= Flatten[ {a, f[b, c], f[a, b, d]}, 1, f ]

	Out[5]= {a,b,c,a,b,d}

I modified In[5] as follows ...

	In[1]:= Flatten[ { {a, f[b, c], f[a, b, d]}, {g, f[e, g]} }]

	Out[1]= {a, f[b, c], f[a, b, d], g, f[e, g]}	
	
I don't see why adding {g, f[e, g]} as a second list to the In[5] example
unflattens Flatten's answer.  What am I misunderstanding?

Thanks.
Harold

• Follow-Ups:
  • Re: Understanding Flatten
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>