The low level file I/O functions in MATLAB can be useful to achieve this. You can use fgetl to read lines from the file. Then you can use some tokenize the file using some functions like strtok or strsplit after which you can check for the starting 2. If that is not the case you can read your data in a structure. I am also adding a small sample script for your reference.
fid = fopen('name of file');
% while the end of file is not reached
while ~feof(fid)
% read a line
line = fgetl(fid);
% get the tokens from the line
tokens = strsplit(line,' ');
% check if the line doesnot start with 2
if str2double(tokens{1}) ~= 2
% add the data to some structure.
end
end
I hope this helps !
