loop-free numeric array indexing when numeric array inside cell array

Question

Joshua Carmichael 2012-3-15

My objective is to apply a given function "myfun" to each column within a cell array, using an index vector. I provide an example to be more clear:

C = cell of size(C) = [M, 1];

Each row of C contains an array of the same size. I will call the "k_th" array A_k so that C{k,1} = A_k.

ind = a cell array the same size as C, containing integers.

icol = an array of integer shift values where size(icol) = [size(A_k,2), 1];

Goal: Shift a certain columns ind{k}, in each A_k contained within C by an amount specified by vector icol( : , ind{k} ) WITHOUT the following loop:

 for k = 1:size(C,1),
    this{k} = circshift( C{ k , 1}, icol( : , ind{k} ) );
 end;

I often use "cellfun" or "arrayfun" to operate on arrays, but this seems harder. Thank you in advance.

Answer 1

Geoff 2012-3-15

You can use cellfun for this if you combine the C and ind cell arrays: ie chuck the ind array as a new column in C.

I will give this a shot--thanks!