Convert a cell array of cells to cell arrays of doubles

Question

Let's say, that i have a cell array of cells containing only numeric values. Its name is Q.

Q = { {[0]    [1]    [0]    [238]} }
Q{1}

ans = 

    [0]    [1]    [0]    [238]

What i would like to do, is to combine all these 4 cells into just one. In that case, it would be something like the one below:

Q{1}

ans =

     0     1     0   238

Any help would be really appreciated.

Answer 1

You have a double-nested cell array:

Q = { {[0]    [1]    [0]    [238]} }

and you need comma-separated lists to transform it into an array. I assume you have multiple cell arrays within Q, so you can use cellfun:

out = cellfun(@(x) [x{:}], Q,'uni',0)

and you get

Q{1} = 

    [0]    [1]    [0]    [238]


out{1} =

     0     1     0   238

For one element this is equivalent to:

Q{1} = [Q{1}{:}]

as the x in the cellfun operation is equivalent to Q{i} where i is the running variable.

But if you you just have this one array in your cell array, consider:

out = cell2mat(Q{:})

as you don't need it to be a cell array at all.