Calculate two's complement for a signed integer in MATLAB.
function [data_out] = twos_comp(data, bits)
% twos_comp converts input variable
% "data" to it's twos complement
% value. Input variable "data" is
% expected to be hexadecimal.
data_out = hex2dec(data) ;
if data_out >= 2^(bits - 1)
data_out = data_out - 2^bits ;
How about this...
twos = 1+bitcmp(uint16(-x));
if N is the number of bit
and b an array of integer to convert in signed this operation could be faster
if( b(n) > (2^(N-1)-1))
function value = dec2tc(dec, N)
value = dec2bin(mod((dec),2^N),N);
function value = tc2dec(bin,N)
val = bin2dec(bin);
y = sign(2^(N-1)-val)*(2^(N-1)-abs(2^(N-1)-val));
if ((y == 0) && (val ~= 0))
value = -val;
value = y;
there is a easier way to calculate the two's complement:
twos_comp = dec2bin(mod((value),2^bits),bits);
look at a those two's complement circles then you will see why it works.
Handy for 16 bit numbers, but not anything else. It even takes an input for what appears to be the number of bits (i.e. other than 16), but never utilizes it. Good start on a function that could be far more useful.
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