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    %% 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.

% Copyright 2015 The MathWorks, Inc.

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);