CODEWITHSUNDEEP
filematlab
C graphics
C graphics

Reputation: 7458

MATLAB array of int32 and writing to file

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);

Upvotes: 4

Views: 369

Answers (1)

gnovice
gnovice

Reputation: 125874

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');

Upvotes: 2

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