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bytfarr(file, dimensions [, offset=offset,
/readonly, /swap])
Returns a file array that links a byte array dimensional
structure with the specified dimensions to the specified
file. dimensions may be an array, or up to
#max_dims arguments each of which contains one dimension. The
file need not exist. offset indicates the length in bytes
of a file header after which the array data is to be found. It defaults
to zero. Keyword /readonly disallows writing into the file
through the file array. Keyword /swap indicates that the data
should be byte-swapped after reading (for input only).
See also: File Arrays, #max_dims, File Array Creation