Binary data dealing with fread

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Kei Manabe
Kei Manabe on 19 Nov 2018
Commented: Jan on 20 Nov 2018
I have a binary data file. When I look into the file in a Hex editior, I can see a 32 bit Hex value, 'F9 BD FF FF.' When I read it as fread(fid,1,'bit32','ieee-le'), the value is read as -3.448212000000000e+05. I do not understand the calculation. Could you let me know, please?

Accepted Answer

Jan on 20 Nov 2018
I cannot confirm this.
a = uint8(sscanf('F9BDFFFF', '%2X'));
fid = fopen('test.bin', 'w');
fwrite(fid, a, 'uint8');
fid = fopen('test.bin');
b = fread(fid,1,'bit32','ieee-le') % -16903
Please post some code, which reproduces your observations.
  1 Comment
Jan on 20 Nov 2018
Kei Manabe wrote: I have tried your code and got same result. Finally, I have found the code
"y = y*20.4;"
at around the end of the code lol...
Thank you so much for your cooperation!!

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