logpoissnormal=function(theta,datapar)
{
y=datapar$data
npar=datapar$par
lambda=exp(theta)
loglike=log(dgamma(lambda,shape=sum(y)+1,scale=1/length(y)))
logprior=log(dnorm(theta,mean=npar[1],sd=npar[2]))
return(loglike+logprior)
}
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