Re: Convert Array to Simple List

• To: mathgroup at smc.vnet.net
• Subject: [mg86995] Re: [mg86940] Convert Array to Simple List
• From: Murray Eisenberg <murray at math.umass.edu>
• Date: Fri, 28 Mar 2008 03:17:07 -0500 (EST)
• Organization: Mathematics & Statistics, Univ. of Mass./Amherst
• References: <200803271315.IAA19529@smc.vnet.net>

```If the elements a,b,c,d are themselves _not_ lists, then:

Flatten[{{a, b}, {c, d}}]
{a, b, c, d}
Flatten[Transpose[{{a, b}, {c, d}}]]
{a, c, b, d}

If, however, the elements may themselves be lists (and possibly nested
lists), then you may want to use an additional argument to Flatten, e.g.:

Flatten[{{a, {b1, b2}}, {c, d}}, 1]
{a, {b1, b2}, c, d}

Unless what you want in this case is also just one level of list; then:

Flatten[{{a, {b1, b2}}, {c, d}}]
{a, b1, b2, c, d}

Pierre wrote:
> I need to convert an Array (List of List) to a simple List by concatening the colums or the lines.
>
> e.g. : {{a,b},{c,d}}  ==>{a,b,c,d}
> or
> {{a,b},{c,d}}  ==>{a,c,b,d}
>

--
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

```

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