Find the values from the index in another matrix

I have a .txt file (file 1) with row numbers and 5 columns with information for an entire month, where the first column is the index. I would then like to look in other files for the values of variable G corresponding to this index. How could I do it? This is a part of file 1:

13180 -5.247 -37.274 21.2 5000
13181 -5.256 -37.274 22.5 5000
13182 -5.265 -37.274 22.0 6000
13183 -5.274 -37.274 24.5 6000
13184 -5.283 -37.274 24.2 11000
13185 -5.292 -37.274 35.0 11000
13653 -5.005 -37.265 23.0 11000
13654 -5.014 -37.265 30.0 11000
13655 -5.023 -37.265 40.5 11000
13677 -5.220 -37.265 25.5 5000
13678 -5.229 -37.265 28.8 6000
13679 -5.238 -37.265 31.7 6000

I'm trying to do it this way, but the output file is very large (about 55 GB) and with several NaN that are placed when the index is not found within that file.

str='/home/pink/Documents';
folder_name = uigetdir(str);
files = dir(fullfile(folder_name,'*.dat'));
curr_folder=pwd;
cd(folder_name);

fid = fopen('/home/pink/Documents/file_out.txt','w');

for i = 1:length(files); 
    
    fileID = fopen(files(i).name); 
    data = fread(fileID,[500 500], 'float32'); 
    data((data==-99.0))=NaN;
    fclose(fileID);
    
    data = rot90(data);
         
    latitude = [-3.63965:-0.00898:-8.12601]; 
    longitude = [-37.5098:0.00906:-32.9831]; 

    L1 = 1; 
    L2 = 500;

    for LL = L1:L2;
    	array_lat (1:500,LL) = lat;
    end

    array_lati = array_lat(1:500,1:500);
    array_lati;

           
    for Lll = L1:L2;
       	array_long(Lll,1:500) = long;
    end

    array_lon = array_long(1:500,1:500);
    array_lon;
  
    file = load('/home/pink/Documents/file_input.txt');

    idx = file(:,1);
    lat = file(:,2);
    long = file(:,3);
    ref = file (:,4);
    alt = file (:,5);

    zdr_et = zdr(idx);
    
    B=cat(2,idx,lat,long,ref,alt,zdr_et);
       
    fprintf(fid,'%d %.3f %.3f %.1f %d %.1f\n',B');  
    
end

fclose(fid);