ECDSA Signature

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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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This code gives me a signature r,s=C2=A0<div><br /></div><div>std::string s=
ignaturehex;<span style=3D"white-space: pre;">	</span><br />StringSource ss=
2(message, true,<br /><span style=3D"white-space: pre;">	</span>new CryptoP=
P::SignerFilter(prng, signer,<br /><span style=3D"white-space: pre;">		</sp=
an>new CryptoPP::HexEncoder(<br /><span style=3D"white-space: pre;">			</sp=
an>new CryptoPP::StringSink(signaturehex))));<br /></div><div><br /></div><=
div>=C2=A0I understand that r is the x coordinate of a point R in the elipt=
ic curve, considering I have private key, public key r,s values of the sign=
ature and the message signed, is it possible to find the Y coordinate of po=
int R?</div><div><br /></div><div>Thanks,</div>

<p></p>

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