This code gives me a signature r,s 

std::string signaturehex; 
StringSource ss2(message, true,
new CryptoPP::SignerFilter(prng, signer,
new CryptoPP::HexEncoder(
new CryptoPP::StringSink(signaturehex))));

 I understand that r is the x coordinate of a point R in the eliptic curve, 
considering I have private key, public key r,s values of the signature and 
the message signed, is it possible to find the Y coordinate of point R?

Thanks,

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