MATLAB: Concatenating cell array elements

cell arraysconcatenationMATLAB

Hi,

Suppose I have two cell arrays, A and B. Both cell arrays are of size 1 X n and size(A{i}) = size(B{i}) for all i = 1:n. Thus, for example

A =

    [1x3 double]    [1x4 double]    [1x6 double] ...

and

B =

    [1x3 double]    [1x4 double]    [1x6 double] ...

I want to concatenate A and B such that the result C will look like

C =

    [2x3 double]    [2x4 double]    [2x6 double] ...

In C, C{i}(1,:) = A{i} and C{i}(2,:) = B{i} for all i = 1:n.

What's the quickest way to do this?

I appreciate your help.

C= cellfun(@(x,y) [x;y],A,B,'un',0)

>>c = {[]};
>>class(c{1})
ans = double
>>isempty(c{1})
ans = 1

Or if you really want to be specific:

c = {double.empty(0)};

Here is one way:

C = {[1 6 7 9],  [1 6 7 9], [1 6 7 9];
     [8], [8], [2 6 7 9]};
 [ii,jj] = find(cell2mat(cellfun(@(x) any(ismember(x,2)),C,'UniformOutput',false)))

If you have more than one cell location with a 2 in it, ii will have all the row coordinates, and jj will have all the column coordinates.

There is a lot buried in that one line of code, including some assumptions about how you want this to generalize.