write in text file

I would like to write a string of hex numbers to a text file. What I want in the file is like this:

00000000  00000000......00000000  00000000
1111111F  10123BD9......34GA0342  06FFFFFF
...

i.e. every 8 numbers separated by some space and every row shall contain 256 such groups of numbers. My code is the following:

       fileID = fopen('text.txt','w');
       z=0;
       for i=1:8:1024*2
           fprintf(fileID,'%s \t',A_HEX(i:i+8-1));
           z=z+1;
           if z>=256
               fprintf(fileID,'%s \n','');
               z=0;
           end
       end
    fclose(fileID);

However,in the text file it looks like a mess-up. I attached the 'test.txt' below.

[Walter Roberson]

'G' in a hex output would indeed be really messed up :)

Answer 1

[Stephen23]

One fast solution is to not use a loop:

str = dec2hex(randi([0,15],1,5000));
fmt = repmat(sprintf('%s\t',repmat('%c',1,8)),1,256);
fmt = sprintf('%s\n',fmt(1:end-1));
fid = fopen('temp0.txt','wt');
fprintf(fid,fmt,str)
fclose(fid)

Answer 2

[Jan]

fmt = [repmat('%c%c%c%c%c%c%c%c   ', 1, 256), char(10)];
fid = fopen('temp0.txt', 'W');
fprintf(fid, fmt, A_HEX);
fclose(fid)