EEPW论坛

clc;
clear all;
fid=fopen('sy.txt','r+');
if(fid==-1)

  display('File not exist!');

   return;

end

while(~feof(fid))
g=fgets(fid);
a=str2num(g);
     if a>2000&&a<4000
         e=fopen('new3.txt','a+');
         fprintf(e,'%5.7g\r\n',a);
         fclose(e);
     end
end
fclose(fid);