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matlabbinarydecimalsigned

Convert binary to signed decimal

I'd like to convert a binary vector to a signed decimal in matlab using the classic functions.

I have a vector byte = [1 0 0 0 0 0 1 0],

if I convert it to decimal with byte = bi2de(byte, 'left-msb') I get 130, but if I insert this byte in a calculator I get -126, ergo signed.

I tried byte = typecast(bi2de(byte, 'left-msb'), 'int32'), but failed miserably.

How would I achieve this?

Solution

  • One way of doing it:

    >> typecast(uint8(bi2de(byte, 'left-msb')), 'int8')

ans =

 -126