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RE: Converting {{a,b},{c,d}} to just {a,b},{c,d} (no en closing parens) ?

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  • Subject: [mg28774] RE: [mg28766] Converting {{a,b},{c,d}} to just {a,b},{c,d} (no en closing parens) ?
  • From: "Barthelet, Luc" <lucb at>
  • Date: Sat, 12 May 2001 01:36:42 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Use Line[ Join[{p1,p2,p3,p4},Table[...,{i,5,20}] ] ]

-----Original Message-----
From: aes [mailto:siegman at]
To: mathgroup at
Subject: [mg28774] [mg28766] Converting {{a,b},{c,d}} to just {a,b},{c,d} (no
enclosing parens) ?

How can I convert a list of pairs, like

    {{a,b},{c,d},{e,f},. . . }} 

into just a sequence of pairs, i.e.

   {a,b}, {c,d}, {e,f}, . . .

with no outer { }'s?

Reason for doing this?  Want to define a Line in the form

   Line[{pt1, pt2, pt3, pt4, pt5, pt6, . . . . . . }]

where some of the points, say pt1 through pt4 are individually defined; 
but then a sequence, say pt5 through pt20, are defined by a Table; then 
pt21, etc are back to individual definitions.

I know -- I could break these into a sequence of Lines -- but it would 
be cleaner if there were a simple way to have one Line[ ]  command with 
all the points inside it.

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