MATLAB Programming

Accessing Files with Memory-Mapping
Mapping Multiple Data Types and Arrays. If the region being mapped is
composed of segments of varying data types or array shapes, you can specify
an individual format for each segment using an N-by-3 cell array, where N
is the number of segments. The cells of each cell array row identify the data
type for that segment, the array dimensions to map the data to, and a field
name by which to reference that segment:
objname = memmapfile(filename, ...
'Format', { ...
datatype1, dimensions1, fieldname1; ...
datatype2, dimensions2, fieldname2; ...
: : : ...
datatypeN, dimensionsN, fieldnameN})
The following command maps a 24 kilobyte file containing data of three
different data types: int16, uint32, andsingle. Theint16 data is mapped
as a 2-by-2 matrix that can be accessed using the field name model. The
uint32 data is a scalar value accessed as field serialno. Thesingle data
isa1-by-3matrixnamedexpenses.
Each of these fields belongs to the 800-by-1 structure array m.Data:
m = memmapfile('records.dat', ...
'Offset', 2048, ...
'Format', { ...
'int16' [2 2] 'model'; ...
'uint32' [1 1] 'serialno'; ...
'single' [1 3] 'expenses'});
6-49