MATLAB: Convert a non uniform cell array of cell arrays to matrix

cell arraycell array into cell arraydoubleMATLABmatrixmulti level cell array

I have the following code:
%% Loading the data
rhoPart = 2540;
files = dir(fullfile(uigetdir,'\**\*.data*'));
[~,Index] = natsort({files.name});
files = files(Index);
folders = {files.folder};
folder_groups = findgroups(folders);
k = 1;
for i = 1:length(files)
    fid = fopen(fullfile(files(i).folder,files(i).name),'r');
    %% Reading the data
    % Read all the data from the file
    dataRead = textscan(fid,'%f %f %f %f %f %f %f %f %f %f %f %f %f %f','HeaderLines',1);
    frewind(fid);
    % Write headerline N, time, xmin, ymin, zmin, xmax, ymax, zmax
    runData{k} = strsplit(fgetl(fid), ' ');
    % Write only the x, y, and z components of the particles, particle radius,
    % z component+ particle radius and volume of the particle
    expData{k} = [dataRead{1}(:,1) dataRead{2}(:,1) dataRead{3}(:,1) dataRead{7}(:,1) dataRead{3}(:,1)+dataRead{7}(:,1) rhoPart*(4/3)*pi*(dataRead{7}(:,1).^3)];
    % Write only the vx,vy,vz of the particles and magnitude
    velData{k} = [dataRead{4}(:,1) dataRead{5}(:,1) dataRead{6}(:,1) sqrt(dataRead{4}(:,1).^2 + dataRead{5}(:,1).^2 + dataRead{6}(:,1).^2)];
    fclose(fid);
    k = k + 1;
end
%% Classify (into a structure)
runData_struc = splitapply(@(x) {x}, runData, folder_groups);
expData_struc = splitapply(@(x) {x}, expData, folder_groups);
velData_struc = splitapply(@(x) {x}, velData, folder_groups);
This will give me the following cell array of runData_struct (see pictures)
As you can see this is a cell array in a cell array. I want to convert the 1×9 cell into a 1×9 double. For example:
runData_struc{1,1}
row 1: 1×9 double
row 2 :1×9 double
row 3: 1×9 double
…
row 2741: 1×9 double
runData_struc{1,2}
row 1: 1×9 double
row 2 :1×9 double
row 3: 1×9 double
…
row 2745: 1×9 double
I tried the following, but it gave me NaN as result:
https://www.mathworks.com/matlabcentral/answers/231291-how-to-convert-a-cell-array-of-cell-arrays-to-matrix

Best Answer

(see comments on question for details not related to the title question)
A1 = cell2mat(runData_struc{1});
A2 = cell2mat(runData_struc{2});
if that doesn't work, something like this might (but I'm not the cellfun expert)
A1 = cell2mat(cellfun(@cell2mat,runData_struc{1},'UniformOutput',false));
A2 = cell2mat(cellfun(@cell2mat,runData_struc{2},'UniformOutput',false));
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