Can you give me an example about writing file by the memmapfile function ? think you very much.
3 views (last 30 days)
Show older comments
Can you give me an example about writing file by the memmapfile function ? think you very much.
2 Comments
Answers (1)
Stephen23
on 4 Jul 2016
Edited: Stephen23
on 4 Jul 2016
Here is the first example from the memmapfile documentation, with one change: the addition of the 'writable' option:
>> myData = uint8(1:10)';
>> fileID = fopen('records.dat','wt');
>> fwrite(fileID, myData,'uint8');
>> fclose(fileID);
>> m = memmapfile('records.dat','writable',true); % <- add "writable" option
>> m.Data % check data
ans =
1
2
3
4
5
6
7
8
9
13
10
And we can write to that file very simply:
>> m.Data(3) = 255; % write a new value for third element
>> m.Data % check data
ans =
1
2
255
4
5
6
7
8
9
13
10
>>
That is all... you can simply treat the m object as a structure, and the Data array as an Array, accessing the elements as you wish. Read the docs for more information.
0 Comments
See Also
Categories
Find more on Image Segmentation and Analysis in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!