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
>