MATLAB Programming

6 Data Import and Export
d = m.Data;
whos d
Name Size Bytes Class
d 100x1 800 double array
Grand total is 100 elements using 800 bytes
Read a selected set of numbers from the file by indexing into the
single-precision array m.Data:
d(15:20)
ans =
1.0e+009 *
3.6045
2.7006
0.5745
0.8896
2.6079
2.7053
Example 2 — Formatting File Data as a Matrix
This example is similar to the last, except that the constructor of the
memmapfile object now specifies an array shape of 4-by-6 to be applied to the
data as it is read from the mapped file. MATLAB maps the file contents into a
structure array rather than a numeric array, as in the previous example:
m = memmapfile('records.dat', ...
'Format', {'double', [4 6], 'x'}, ...
'Offset', 1024, 'Repeat', 100);
d = m.Data;
whos d
Name Size Bytes Class
d 100x1 25264 struct array
Grand total is 2500 elements using 25264 bytes
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