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>*Reply-to*: murray at math.umass.edu

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

**References**:**Convert Array to Simple List***From:*Pierre <pierre-emile.lhuillier@mines-nancy.org>