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

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

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

-----Original Message-----
From: aes [mailto:siegman at stanford.edu]
To: mathgroup at smc.vnet.net
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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