Matlab reads hexadecimal numbers and converts them into signed short

Work needs , Need to read hexadecimal data , And into short Data of type , In fact, there are often such data in fixed-point complex operations , however matlab In data conversion , No, c flexible , Still took some trouble . Tried direct forced conversion int16 The data of , Find out matlab Directly discard the symbol bit , That's why I came up with this method .

% The functionality ： This program is to read in a hexadecimal data , Put it 16bits Form a symbolic 
%short Type data 
clc;
clear;
close all;
fid = fopen('test.txt');% Open file , Hexadecimal data is stored here 
fseek(fid,0,'bof');% take fid Point to the beginning of the file 
data = fscanf(fid,'%x',[1,20]);% Read 20 Bytes of data 
data_unshort = zeros(1,10);% Create a 1*10 The matrix of stores unsigned data 
data_short      = zeros(1,10);% Create a 1*10 The matrix of stores signed data 
data = int32(data);% Force conversion to signed 32bit The data of , Avoid using char Type data operation is out of bounds .
j =1 ;% The array subscript  
for i = 1:2:20;
    data_unshort(j) = data(i)*256 + data(i+1);% Combine two bytes of data to form a short Type data 
    sign_flag =  bitget(data_unshort(j),16:16);% Read the first 16bit The data of , As a sign bit 
    if 1 == sign_flag ; % Meet the conditions , The explanation is negative 
        % Consider this data as a complement  , Complement code   subtract 1, Then remove the highest position , It's the inverse code .
        data_unshort(j) =data_unshort(j) -1 -32768; 
        % In addition to the sign bit, the inverse code bit Reverse is the original code 
        data_unshort(j) =  bitxor(data_unshort(j),32767);
        % Adding symbols to the original code is symbolic short Type data 
        data_short(j) = -int16(data_unshort(j)) ; 
    else % If it's a positive number , Then there is no need to transform .
        data_short(j) = data_unshort(j) ;   
    end
    j =j+1;
end
data_max = max(data_short);
data_min  = min(data_short);
x   = 1:10;
y   = data_short;
plot(x,y);
title(sprintf('max = %d ,min = %d',data_max,data_min));