[ADMB Users] conditional statement using parameter to be estimated

[bigA]

Hum... is yrKey(n) an integer and cp something else?  I think the
problem has something to do with that.
I am not sure the best way to solve your problem, but it appears that
the < operator doesn't work with the data types you are using.
Best luck!
Aaron

On Fri, May 23, 2014 at 2:29 PM, Tiffany Vidal <tiffany.vidal at gmail.com> wrote:
> Hello,
>
> I'm just starting to use ADMB, and am interested in running a something like
> a changepoint model. I am running into problems trying to use a parameter,
> to be estimated, in a conditional statement. When estimating the negative
> log likelihood I have code that looks like this:
>
>  if(useNB==1){
>     for(int n=1;n<=nobs;n++){
>
>      if(yrKey(n)<cp){
>
> mu_hat(n)=f0+rS1(siteKey(n))+(f1+rSs(siteKey(n)))*Cyear(n)+rY(yrKey(n));
>         }
>      else {
>
> mu_hat(n)=f0+rS2(siteKey(n))+(f1+rSs(siteKey(n)))*Cyear(n)+rY(yrKey(n));
>       }
>       NB_mu(n)=mfexp(mu_hat(n));
>
>                nll +=
> -log_negbinomial_density((catch(n)),(NB_mu(n)),(1+((NB_mu(n))/s)));
>     }
>   }
>
>
> where cp is my changepoint parameter (intended to estimate a single year in
> the series), bounded between 0 and max(year index), with an initial value of
> 30 (max year index = 50). The point of this is to allow the random site
> parameter to be estimated separately for the period before the changepoint
> and after it.
>
> The error that I receive is as follows:
> error: no match for 'operator<' in
> '((df1b2_parameters*)this)->df1b2_parameters::<anonymous>.df1b2_pre_parameters::<anonymous>.model_parameters::<anonymous>.model_data::yrKey.ivector::operator()(n)
> < ((df1b2_parameters*)this)->df1b2_parameters::cp'
>
> Is this possible to do in this program? Thank you in advance for any
> thoughts on how to execute this.
>
> Kindly,
> Tiffany
>
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