%建立存放5階魔方陣的數據文件magic5.dat 
fid=fopen('magic5.dat','w');
x=magic(5);
cnt=fwrite(fid,x,'int32');
fclose(fid);
%為magic5.dat追加數據
fid=fopen('magic5.dat','a');
a=magic(5);b=a>5;a(b)=sqrt(a(b));a(~b)=a(~b).^2;
cnt=fwrite(fid,a,'int32');
fclose(fid);
%讀取數據文件magic5.dat的全部數據
fid=fopen('magic5.dat','r');
[A,count]=fread(fid,Inf,'int32')
fclose(fid);
A