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Re: Re: Package to 'graft' Lists onto Matrices

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87798] Re: [mg87739] Re: Package to 'graft' Lists onto Matrices
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Thu, 17 Apr 2008 06:57:26 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200804160906.FAA24077@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

Yes, that works. Indeed, it was exactly the sort of thing I got used to 
doing years ago with the array-processing language APL (but no longer 
had to do once Ken Iverson invented the idea of rank of a "verb").

Still, the method seems "excessive" and perhaps even "sneaky" to me -- 
transposing twice.  And it might be rather inefficient as the matrix 
size grows (although I haven't tested timings).

Bill Rowe wrote:
> 
> In[19]:= m = Partition[Range[9], 3];
> 
> ... if I wanted to add a column I could do
> 
> In[22]:= Transpose@Join[Transpose@m, {data}]
> 
> Out[22]= {{1, 2, 3, 2}, {4, 5, 6, 0}, {7, 8, 9, 0}}

-- 
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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