CDBLFARR(file, dimensions [, OFFSET=offset, /READONLY])
Links a CDOUBLE array dimensional structure with the specified
dimensions to the specified file.
dimensions may be an array, or a list of up to ten
dimensions. The file need not exist. offset indicates the
length in bytes of a header after which the array data is to be found.
It defaults to zero. Keyword /READONLY disallows writing to the
disk file through the file array.
See also: File Arrays, File Array Creation, Complex Functions
[3.1.428]