MATLAB: Cell array: select only 1×3 double cells

cell arraycell arraysMATLAB

Hi everyone,

i have a 1×4 cell array like this:

{[0.1]} {1×3 double} {[0.02]} {1×3 double}

and i want to extract only the 1×3 double cells (of which I do not know the exact location into cell array).

Thank's a lot!

Riccardo Rossi

Where C is your cell array:

X = cellfun('length',C)==3;
out = C(X)

I'm tempted to ask how this data got to be a cell array, when it should really have been a 3x6x6x645 numeric array. We can fix that, though:

A=reshape( cat(4,cellArray{:})  ,3,6,6,[]);
result = sum(A,4);

Here is one way:

Build test data:

 >> c = {randi(10,1,3), randi(10,1,4),randi(10,1,2),randi(10,1,3)}'
 c = 
    [1x3 double]
    [1x4 double]
    [1x2 double]
    [1x3 double]

Sort cells' content length, get indices of ordered lengths:

 >> [~,id] = sort( cellfun( @length, c ))
 id =
     3
     1
     4
     2

Use indices to sort original cell array:

 >> c = c(id)
 c = 
    [1x2 double]
    [1x3 double]
    [1x3 double]
    [1x4 double]