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Two's Complement for MATLAB



13 Jul 2004 (Updated )

Calculating two's complement for a decimal number.

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Calculate two's complement for a signed integer in MATLAB.


This file inspired Two's Complement.

MATLAB release MATLAB 6.5 (R13)
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Comments and Ratings (7)
23 Feb 2012 Robert

How about this...

twos = 1+bitcmp(uint16(-x));

30 Jan 2012 duanra

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))

13 Nov 2010 Hassan Naseri

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;

07 Sep 2007 Rafael Baur

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.

07 May 2007 Chad Webb

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.

22 Apr 2007 igi donegor  
02 Jan 2007 Shyang-Wen Tseng

It is fascinating to read the author's wit of how to program to get the two's complement of an integer number. It is very useful not only in its usage but also its wit of programing it. Thank you.

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