MATLAB: Convert Hexadecimal value to signed integer

hexadecimal to signed integerMATLABnumber system conversion

Hi, I have a .bin file in which data is stored in hexadecimal format. I want to do the following:

1. Read the hexadecimal data from the .bin file.

2. Convert the data into signed integer. For instance, if we have FF5C in the file, I want to read it and convert it into its corresponding signed integer representation which is -164.

Could anyone please show me the code to do so. Thank you in advance.

Best Answer

You haven't given enough information about your file for us to help much with question 1.

If it's a text file, use fopen, fgetl or similar and fclose. If it's a binary file, use fopen, fread and fclose.

For question 2., if it's a binary file, fread can read the data as signed integer as is. Use:

out = fread(fid, numvalues, *int16);

If it's a text file, convert your hexadecimal string with:

out = typecast(uint16(base2dec(hexstring, 16)), 'int16');

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MATLAB: Read hex data from txt file and convert to signed integer

I just figured out the answer myself and am sharing here for others.

filename = 'Filter_Output.txt';
q = quantizer('fixed', 'nearest', 'saturate', [10 0]);% quantizer object for num2hex function  
FID = fopen(filename);
dataFromfile = textscan(FID, '%s');% %s for reading string values (hexadecimal numbers)
dataFromfile = dataFromfile{1};
decData = hex2num(q, dataFromfile);
decData = cell2mat(decData);
fclose(FID);

MATLAB: How to read .bin file

fid = fopen('YourFile.bin', 'r');
data = fread(fid, '*int16');
fclose(fid);

You might need to reshape() the data afterwards.

Depending on how the data was produced and what machine you are using to read it, you might find it necessary to swap the bytes in each integer. There is a MATLAB swapbytes() routine, or there is a FEX contribution http://www.mathworks.com/matlabcentral/fileexchange/17661-swapbytes-c-mex-function that is likely to be faster.

Alternately you might want to add the 'ieee-be' or 'ieee-le' option to the fread() call; that should save you from having to swap the bytes yourself, when the routine that produced the .bin file bothered to document the byte order.

Note: in general, .bin files are not 16 bit signed integers. ".bin" is any arbitrarily complicated binary format, and two .bin files produced by the same program will not necessarily be the same internal format.

Best Answer

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MATLAB: Read hex data from txt file and convert to signed integer

MATLAB: How to read .bin file

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