MATLAB array of int32 and writing to file

Question

In the code below I am expecting the file size to be 4096 bytes (4kb) right? But in practice the file size becomes 1024 bytes (1kb)! I don't understand why?

fid = fopen('test.test', 'w', 'b');
buff= zeros(1024,1,'int32');
fwrite(fid,buff);
fclose(fid);

Also, if you are dealing with files, this post might interest you - stackoverflow.com/questions/8847866/… — Andrey Rubshtein
– Andrey Rubshtein, Commented Feb 24, 2012 at 18:44

gnovice · Accepted Answer · 2012-02-24 18:42:40Z

2

The problem is that FWRITE, by default, writes data out as 'uint8' type (i.e. one quarter the size of an 'int32'). It doesn't automatically detect the type of the data passed to it, so you need to specify the type for the output in the call to FWRITE, like so:

fwrite(fid, buff, 'int32');

answered Feb 24, 2012 at 18:42

gnovice

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