%% Append Data to Binary File
% Write a binary file containing the elements of the 4-by-4 magic square, stored as double-precision floating-point numbers.

fileID = fopen('magic4.bin','w');
fwrite(fileID,magic(4),'double');
fclose(fileID);

%
% Open the file, magic4.bin, with write-access that enables appending to the file. Specify the file-access type, 'a', in the call to fopen.

fileID = fopen('magic4.bin','a');

%
% Append a 4-by-4 matrix of zeros to the file. Then, close the file.

fwrite(fileID,zeros(4),'double');
fclose(fileID);

% Copyright 2015 The MathWorks, Inc.