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getting an error message when using hmcSampler

1 次查看（过去 30 天）
ektor
ektor 2019-5-28
关闭： MATLAB Answer Bot 2021-8-20
Dear all,
I have this log-function on which I apply the hmcSampler:
T=1000;
g=randn(T,1);
u=randn(T,1);
k1=0.01;
k2=0.02;
for ii=1:T
logf=@(x)func(x,g, k1, k2,ii, u);
smp = hmcSampler(logf,u(ii))
end
where
function LL= func(x,y,k1,k2, t,u)
u(t)=x;
e2=(y-u).^2;
kk=- 0.5*x^2/k2;
M=-.5*sum(e2)/k1;
LL=M+kk;
end
Then, I get this error
Error using
stats.mcmc.utils.InputValidator.validateLogPDFAndStartAnalyticalGradient (line
346)
Error in calling log posterior density with the specified starting point.
Error in stats.mcmc.HamiltonianSampler.processLogPDFAndStartAnalyticalGradient
(line 577)
[~,~,isGradientRowVector] =
stats.mcmc.utils.InputValidator.validateLogPDFAndStartAnalyticalGradient(logpdf,start');
Error in stats.mcmc.HamiltonianSampler (line 284)
[logpdf,start] =
stats.mcmc.HamiltonianSampler.processLogPDFAndStartAnalyticalGradient(logpdf,start);
Error in hmcSampler (line 99)
hmc = stats.mcmc.HamiltonianSampler(logpdf,start,varargin{:});
Error in Main_code (line 53)
smp = hmcSampler(logf,u(ii))
Caused by:
Error using func
Too many output arguments.
I can not find what is causing this problem. "Too many output arguments."?
Any ideas,
Thanks a lot

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