using fscanf to open file

clear all

TOL=[10^-3 10^-4 10^-5 10^-6 10^-7 10^-8 10^-9]

fileID = fopen('relp1.dat'); formatSpec = '%f';

A1= fscanf(fileID,formatSpec)

fclose(fileID);

fileID = fopen('relp2.dat');

[A2]= fscanf(fileID,'%f')

fileID = fopen('relp3.dat');

[A3]= fscanf(fileID,'%f')

% sorting the data

A1INT=[A1(1,:) A1(3,:) A1(5,:) A1(7,:) A1(9,:) A1(11,:) A1(13,:)]

A1ND=[ A1(2,:) A1(4,:) A1(6,:) A1(8,:) A1(10,:) A1(12,:) A1(14,:)]

A2INT=[A2(1,:) A2(3,:) A2(5,:) A2(7,:) A2(9,:) A2(11,:) A2(13,:)]

A2ND=[ A2(2,:) A2(4,:) A2(6,:) A2(8,:) A2(10,:) A2(12,:) A2(14,:)]

A3INT=[A3(1,:) A3(3,:) A3(5,:) A3(7,:) A3(9,:) A3(11,:) A3(13,:)]

A3ND=[ A3(2,:) A3(4,:) A3(6,:) A3(8,:) A3(10,:) A3(12,:) A3(14,:)]

i keep runnnig into this error

Error using fscanf

Invalid file identifier. Use fopen to generate a valid file identifier.

Error in relp_dat (line 4)

A1= fscanf(fileID,formatSpec)

Answer 1

[Walter Roberson]

   filename = 'relp1.dat';
  [fileID, msg] = fopen(filename);   
  if fileID < 0
    error('could not open file "%s" because: "%s"', filename, msg);
  end

I suspect that you will find that the filename is wrong with confusion between lower case L and digit 1, or else that the file is in a different directory.