write on a numeric array will output the raw bytes, i.e. Column-major data in 
the native byte order. 

Matlab arrays are also column major, so reading a Matlab-produced binary format 
is probably straightforward, but you have to be careful of the byte order. 
Obviously, you'll have to read the documentation on your file format carefully. 
Whatever the format is, however, Julia offers enough low-level control to read 
and write it efficiently. 

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