count_line.m

matlab实用教程

fid = fopen('magic.m', 'r');
count = 0;
while ~feof(fid)
    line = fgetl(fid);
    if isempty(line) | strncmp(line, '%', 1)
        continue
    end
    count = count + 1;
end
disp(sprintf('%d lines', count));