Read LAMMPS dump file using MatLab for post-processing: error: Unable to perform assignment because the size of the left side is 1-by-6 and the size of the right side is 0-by-0

LAMMPS LAMMPS General Discussion
1

Hello, I’m using MatLab to read the LAMMPS dump file to do post-processing:
I used similar code in this link: LAMMPS/readdump_all.m at a92e8c271bcb7add8245f5a32f2920fbe35bacc9 · CFDEMproject/LAMMPS · GitHub

name = 'dump.188000'
try
    dump = fopen(name,'r');
catch
    error('Dumpfile not found!');
end
i=1;
while feof(dump) == 0
    id = fgetl(dump);
     if (strcmpi(id,'ITEM: TIMESTEP'))
            timestep(i) = str2num(fgetl(dump));
    else
     if (strcmpi(id,'ITEM: NUMBER OF ATOMS'))
            Natoms(i) = str2num(fgetl(dump));
     else
      if (strcmpi(id,'ITEM: BOX BOUNDS'))
            x_bound(i,:) = str2num(fgetl(dump));
            y_bound(i,:) = str2num(fgetl(dump));
            z_bound(i,:) = str2num(fgetl(dump));
      else
       if (strcmpi(id(1:11),'ITEM: ATOMS'))
            for j = 1 : 1: Natoms
                atom_data(j,:,i) = str2num(fgetl(dump));
            end
            i=i+1;
       end
      end 
     end
   end
end
disp("-------------------");
disp("----ALL DONE!!!----");
disp("-------------------");

I had an error: Unable to perform assignment because the size of the left side is 1-by-6 and the
size of the right side is 0-by-0.
Error in rubberdumperead (line 34)
atom_data(j,:,i) = str2num(fgetl(dump));

I’d appreciate any help!

2

This is a 13 year old file from an outdated LAMMPS version. It works with old LAMMPS versions only. The dump file format has since changed.
The version of the same file that is bundled with current LAMMPS versions is compatible with the output from atom style dumps from current versions of LAMMPS.