How to read long double?

Hello community,

I need to read long double (C++) from binary file in matlab. Unfortunetly, long double has 10 bytes order (80 bites). How can I do that? Any idea?

Thanks in advance.

Andrew

Answer 1

[José-Luis]

I think the long double type is dependent on the architecture. If you wanted a really robust routine, you could read bit by bit and then transform your data, assuming you know the layout of long double.

 doc fread

A short example:

 fid = fopen('your_file.bin','r');
 A = fread(fid, number_of_values * 2, 'ubit40'); %If your type is 80 bits long
fclose(fid);

Then you would need to reshape A, and find out the double values from the bits. All this might be pointless though, as I think Matlab does not support long doubles natively, so that precision might go to waste. You might be better off typecasting to double in your C++ code before importing to Matlab.

Then again, someone here might correct me.