How to express or write short integers in MATLAB?

Hi there, I am replicating some lines of code from C language in MATLAB evironment. Although I have completed the code but I am still getting some issues therefore, I am having some issue in the generated DATA.

Kindly if someone tell me how to properly use short in MATLAB as shown in the following picture

Here is what I am currently doing in my code

   i_acc = bitshift(int16(i_acc+64),-7);
        q_acc = bitshift(int16(q_acc+64),-7);
        
% %         converting data
%         i_acc = typecast(i_acc, 'int16');
%         q_acc = typecast(q_acc, 'int16');
%         
        % Buffer 
        iq_buff(isamp*2)= i_acc;
        iq_buff(isamp*2+1) = q_acc;

[Bjorn Gustavsson]

You'll get more better help faster if you explain what "some issue" is.

Answer 1

[Arjun]

Hi @Imtiaz nabi,

I see that you want to convert code from C language to MATLAB code.

In MATLAB, you can use int16 in the same way you use short in C code. In the converted code you provided, there are some dissimilarities with the C code. You have type-cast the values and then performed the bit operation, but in the original C code, the order of operations is different, which can result in inconsistent values.

Here is how you can correct it:

% Assuming i_acc and q_acc are previously defined integers 

i_acc = bitshift(i_acc + 64, -7);  % Equivalent to (i_acc + 64) >> 7 

q_acc = bitshift(q_acc + 64, -7);  % Equivalent to (q_acc + 64) >> 7 

% Assuming iq_buff is a preallocated array and isamp is an index 

iq_buff(isamp*2) = int16(i_acc);      % Store as a 16-bit integer 

iq_buff(isamp*2 + 1) = int16(q_acc);  % Store as a 16-bit integer 

Kindly go through the documentation of “int16” for better understanding: https://www.mathworks.com/help/releases/R2022a/matlab/ref/int16.html

I hope this helps!