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Convert a non uniform cell array of cell arrays to matrix

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Tessa Kol
Tessa Kol on 20 Sep 2020
Answered: Sindar on 25 Sep 2020
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 1x9 cell into a 1x9 double. For example:
runData_struc{1,1}
row 1: 1x9 double
row 2 :1x9 double
row 3: 1x9 double
...
row 2741: 1x9 double
runData_struc{1,2}
row 1: 1x9 double
row 2 :1x9 double
row 3: 1x9 double
...
row 2745: 1x9 double
I tried the following, but it gave me NaN as result:
  9 Comments
Tessa Kol
Tessa Kol on 25 Sep 2020
Thank you both for the suggestions and I will adapt my code according to it. Can I accept an answer to close this post?

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Accepted Answer

Sindar
Sindar on 25 Sep 2020
(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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