How to save number of arrays as different instances in a file?

I have saved two arrays in a file but as a single instance. I wish to save them seperately so that I can read them separately as well. This is my code

function A= write(M)
fid=fopen('output.txt','a+');
for i = 1:size(M,1)
    fprintf(fid,'%g\t',M(i,:));
    fprintf(fid,'\n');
end
fclose(fid);

I have two arrays as follows.

a =

      10    20    30
      20    78    89

c =

       1     3
       4     7
       6    89
      10    98

I have stored them already in file. How to make them as separate instances so that when i read I can read the array I want and not just the entire file?

Answer 1

[Walter Roberson]

In text files, there is no way to avoid reading leading information -- in your example, no way to avoid reading the text corresponding to "a" if you are interested in "c".

Binary files, on the other hand, can be "jumped around in".