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Matlab: Convert a signed binary vector into signed integer

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For example, "101" is a negative binary variable. How to convert it into decimal in matlab?
 

Re: Matlab: Convert a signed binary vector into signed integ

Not very straightforward:
Code: 
b='101';
if(b(1)==0)
  d=bin2dec(b(2:3));
else
  d=bin2dec(b(2:3))-3;
end
basically, if the MSB is 1 you have a negative number (2's complement in the example).
 
A somewhat old post, but shouldn't it be something like

Code: 
    function [y] = sbin2dec(x)
        if(x(1)==0)
            y = bin2dec(x(2:end));
        else
            y = bin2dec(x(2:end)) - 2 ^ (length(x) - 1);
    end
 
There is a typo in the code, it should be:

if (x(1)=='0') % instead of ==0

frznchckn said:
A somewhat old post, but shouldn't it be something like

Code: 
    function [y] = sbin2dec(x)
        if(x(1)==0)
            y = bin2dec(x(2:end));
        else
            y = bin2dec(x(2:end)) - 2 ^ (length(x) - 1);
    end
Click to expand...
 

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