converting binary to decimal

i have a value as S=-5

i converted it to binary by

Cw1=dec2bin(typecast(int16(S),'uint16'),15)

now how to convert again to -5

plz assist

Answer 1

[Image Analyst]

Why are you using uint16 when you have a negative number?????

Anyway,...

S = -5;
Cw1=dec2bin(typecast(int16(S),'uint16'),15)

S_recovered = bin2dec(Cw1)
maxUint16 = intmax('uint16')
maxInt16 = intmax('int16')
if S_recovered > maxInt16
  S_recovered = int16(S_recovered - double(maxUint16) - 1)
end

S_recovered will be -5 as a signed 16 bit integer, which is what I assume you want.

Answer 2

[Walter Roberson]

typecast(bin2dec(Cw1), 'int16')

[FIR]

Walter i get

 typecast(bin2dec(Cw1), 'int16')

ans =

      0      0   -160  16623

[Walter Roberson]

typecast(uint16(bin2dec(Cw1)),'int16')