Re: MapThread over ragged arrays

*To*: mathgroup at smc.vnet.net*Subject*: [mg83447] Re: MapThread over ragged arrays*From*: Mark Fisher <particlefilter at gmail.com>*Date*: Wed, 21 Nov 2007 02:39:12 -0500 (EST)*References*: <fhrrbf$583$1@smc.vnet.net>

On Nov 19, 6:17 am, Ravi Balasubramanian <br... 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 Hi, This seems to work too: MapThread[f, #] & /@ Transpose[{mat1, mat2}] --Mark