MATLAB: How to save a Galois Field array to a file in MATLAB 7.8( R2009a)

Question

I have created a Galois Field array using the GF command in Communication Toolbox 4.3 (R2009a). I want to write this array to a file using FWRITE. When I try to write it using the following MATLAB code:

x = 0:3;
m = 2; 
a = gf(x,m); 
fid=fopen('output1.txt','w');
fwrite(fid,a,'ubit1');
fclose(fid);

I get an error message:

 ??? Error using ==> fwrite
 Cannot write value: unsupported class gf

Answer 1

The ability to directly write a Galois Field array to a file is not supported in MATLAB 4.3 (R2009a).

In order to write a galois field array, one needs to convert the GF object to a double and then write to a file. For instance:

x = 0:3; 
m = 2; 
a = gf(x,m); 
a_new =double(a.x);
fid=fopen('output1.txt','w');
fwrite(fid,a_new,'ubit1');
fclose(fid);