How to read and operate on multidimensional cell arrays?

Hi , I am a beginer in MATLAB programming and find cell arrays confusing. I came across a code snippet that looks like

[FileNames,PathName] = uigetfile('*.txt','Select File Containing XRD Data','XRD Data.txt','MultiSelect','on'); 
    if isa(FileNames,'double')
        SpectralData = 0;
        return
    elseif isa(FileNames,'char')
        Temp = FileNames;
        clear FileNames
        FileNames{1} = Temp; %FileNames is name of the file
        clear Temp
    end

      % read in the files
      Spectra = cell(size(FileNames,2),1);
      disp(size(Spectra));
      disp(FileNames);
      for i = 1:size(FileNames,2) % i is the file number
          FileID = fopen([PathName FileNames{i}]);
          Temp = textscan(FileID, '%s','delimiter','');     
          fclose(FileID); %gets names of other files previously loaded
          X = textscan(Temp{1}{1},'%f'); % parse out the 'x' values
          disp(X);
          X = X{1};
          for j = 2:size(Temp{1},1) % j is the sample number Temp{1}=r
              Spectra{i,1}{j-1,1}(:,1) = X; %creates 1-r rows , each having a spectra cell [1 1] for X and Y
              disp(Spectra{1,1}{j-1,1});    %
              Y = textscan(Temp{1}{j},'%f');
              Spectra{i,1}{j-1,1}(:,2) = Y{1}; % save intensity information
          end
      end

The input file contains coordinates of points arranged as a 279*1616 matrix. Dimensions for Temp{1} is 279 * 1616 and X and Y is 1616 *1 cell

I wish to know how is Spectra created and read?

Thanks

[Star Strider]

Do you have a link to that code snippet? Context for it would be helpful.

[Aditya Shanbhag]

actually it's part of a GUI that reads in a file with spectral data and processes it. However, I've updated the code.