MATLAB: How can thousands of matrix lines be written into a multidimensional cell-array

Question

I have created a cell array as follows:

YY = cell(31,10);
for l = 1:numel(YY)
  YY{l} = zeros(1000,3);
end

YY has now 31 rows and 10 columns and each YY{i,j} has now 1000 rows and 3 columns.

The goal is now to fill the individual cells, with the elements of a matrix (which has some thousand lines and three columns).

I have tried the following to write the individual rows of the matrix into the respective cell:

% reading of simulated runoff (simulated)
S = 'runoff.txt'; % name of file (always the same)
D = 'C:\Users\heute\model\model_standalone\'; %pathname
d = dir(fullfile(D,'results*'));                         % file name is changing with consecuitive number
fmtS = ['%s',repmat('%f',1,6)];                            % Format 
opt = {'HeaderLines',1,'CollectOutput',true};              % headerline
L=length(d);                                               % number of sub-folders
C=zeros(L,3);                                          % preallocate
YY = cell(31,10); %create cell array
for l = 1:numel(YY) % create cells with a dimension of (1000,3)
  YY{l} = zeros(1000,3);
end
for k = 1:L  % loop to open files, make calculations and fill the cell arrays
    fid = fopen(fullfile(D,d(k).name,S),'rt');               % open the files with simulated data
    Z=textscan(fid,fmtS,opt{:});                             % read simulated data
    fclose(fid);                                             % close file
    dtS=Z{:,1};                                              % timestamp simulated (datetime)
    Qs=Z{:,2}(:,6);                                          % variable with simulated runoff
    % Define timesteps, which are used for analysis
    yr1=2014; yr2=2016;                                      
    ix=iswithin(dto,datenum(yr1,05,01),datenum(yr1,10,01));  % first year
    for yr=yr1+1:yr2                                         % subsequent years
      ix=ix | iswithin(dto,datenum(yr,05,01),datenum(yr,10,01));
    end
    f_1k = 1-cov(Qs(ix)-Qo(ix))/var(Qo(ix));                 % NSE
    f_2k = rms(Qs(ix)-Qo(ix));                               % RMSE
    f_3k = abs(mean(Qs(ix)-Qo(ix)));                         % BIAS
    C(k,:) = [f_1k, f_2k, f_3k];  
    % write matrix C into the cell array
    YY{k} = C;
end

With this variant, all individual cells are filled with the same values.

Another variant with a for – loop writes only one row in each cell. In this case four cells are filled with only one row.

for ii=1:4
   YY(ii) = {C(ii, :)};
end

How can you solve the problem, that the first 1000 values are written in the first cell, the second 1000 values in the second cell etc?

Answer 1

Write them into a large numeric array, possibly a 4 dimension one. mat2cell() afterwards.