Question

I’m converting some code from Matlab (which I’m not familiar with) to C++. Part of the code reads in a raw data file and inputs every 8 bits into an element of a matrix.

MATLAB:

header=fread(fid, 512, '*uint8');

Similarly, in C++ I have:

fread(&q1[0][0], sizeof(uint8_t), 512, filepath);

These are both reading the same file of course, and the values they spit out match until element #33.

10
0
0
0
244
1
0
0
10
0
0
0
244
1
0
0
10
0
0
0
244
1
0
0
10
0
0
0
208
7
0
0

Then, my C++ program spits out “92” while my Matlab code spits out 180. Values start diverging:

C++ / MATLAB
92 / 180
58 / 118
230 / 219
60 / 133

and keep going on without matching for the rest of the 512 bytes.

Any ideas as to what could be causing this?

Answer 1

Turns out, Matlab was pre-processing the raw file that I was sending in, which changed the headers. Although the files were “copies” (as far as windows was concerned), their headers were different giving me different values when printing out the beginning of the raw data.