MATLAB: How to use an array of files

matrix arraystringsxlsread

I have this code below which I am trying to make an array of files to use in a loop so I don't have to rewrite the same code over and over again, but when I use this method the array only pulls the first letter of the file name making it impossible to access that file. The fname array is the one I am trying to specify, but when I make it a string array it does not recognize the names as a file. Thanks in advance.
   L = 50.8; %Support Span as measured in mm.
  b = 24.75; %Width of rock as measured in mm.
  d = 10.2; %Thickness of rock as measured in mm.
fname = ['Specimen_RawData_1.xls','Specimen_RawData_2.xls',...
    'Specimen_RawData_3.xls','Specimen_RawData_4.xls',...
    'Specimen_RawData_5.xls','Specimen_RawData_6.xls',...
    'Specimen_RawData_7.xls','Specimen_RawData_8.xls',...
    'Specimen_RawData_9.xls','Specimen_RawData_10.xls',...
    'Specimen_RawData_11.xls','Specimen_RawData_12.xls',...
    'Specimen_RawData_13.xls','Specimen_RawData_14.xls',...
    'Specimen_RawData_15.xls','Specimen_RawData_16.xls',...
    'Specimen_RawData_17.xls','Specimen_RawData_18.xls',...
    'Specimen_RawData_19.xls','Specimen_RawData_20.xls',...
    'Specimen_RawData_21.xls','Specimen_RawData_22.xls',...
    'Specimen_RawData_23.xls','Specimen_RawData_24.xls',...
    'Specimen_RawData_25.xls'];
for i = 1:25
      a = xlsread(fname(i));
      x = a(:,3);
      y = a(:,4);
      [ra,ca,va] = find(y > i);
      ta = ra(1);
      [rb,cb,vb] = find(y > i - 10);
      tb = rb(1);
      m = ((y(ta)-y(tb))/(x(ta)-x(tb)))/1e3
      E = ((L^3)*m)/(4*b*d^3)
      n = i;
      plot(n,E,'*')
end

Best Answer

Implement these changes:
% Fname as a cell array of strings
fname = {'Specimen_RawData_1.xls',... 
         ...} 
% note the curly brackets
a = xlsread(fname{i});
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