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Re: MapThread over ragged arrays

  • To: mathgroup at smc.vnet.net
  • Subject: [mg83432] Re: [mg83388] MapThread over ragged arrays
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Tue, 20 Nov 2007 03:53:36 -0500 (EST)
  • Reply-to: hanlonr at cox.net

mat1 = {{1, 2}, {2, 3, 4}, {5, 6}};
mat2 = {{a, b}, {b, c, d}, {e, f}};

f @@@ Thread[#] & /@ Transpose[{mat1, mat2}]

{{f[1, a], f[2, b]}, {f[2, b], 
     f[3, c], f[4, d]}, 
   {f[5, e], f[6, f]}}


Bob Hanlon

---- Ravi Balasubramanian <bravi at cs.washington.edu> wrote: 
> Hello people,
> 
> I have two matrices that are ragged.
> 
> mat1  = {{1, 2}, {2, 3, 4}, {5, 6}}
> mat2 = {{a, b}, {b, c, d}, {e, f}}
> 
> I have to Map a function f at level 2.  So that I have
> 
> {
> {f[1,a],f[2,b]},
> {f[2,b], f[3,c], f[4,d]},
> {f[5,e],f[6,f]},
> }
> 
> MapThread seems to thread only over full arrays, and so I cannot thread 
> over level {2}.  I know I can I do this using two MapThreads (each at 
> level 1), but that seems unnecessary.  Thread seems to apply the head to 
> each value, and if the head does not match, the value is repeated (which 
> might not be necessary).  Seems like a simple thing to do.  Any ideas?
> 
> Ravi
> Univ. of Washington
> Seattle, WA
> 



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