How to express or write short integers in MATLAB?

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Imtiaz nabi
Imtiaz nabi 2022-6-14
回答： Arjun 2024-10-8
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;

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回答（1 个）

Arjun
Arjun 2024-10-8
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!

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