How to find the details of why sampling is not working in some special cases

Modeling
1

I am fitting a model with stan, but get the following error messages:

In validityMethod(object) :
The following variables have undefined values: effpi[1],The following variables have undefined values: effpi[2],The following variables have undefined values: toxpi[1],The following variables have undefined values: toxpi[2],The following variables have undefined values: desri[1],The following variables have undefined values: desri[2],The following variables have undefined values: dose_j. Many subsequent functions will not work correctly.

Some of the generated quantities are NaN. The corresponding posterior parameters are generated without problems. How can I find out what is causing this?

2

Are the gq with NaN values integers? The issue can be caused by simulating values that are too large to be held by int’s

3

Yes, that appears to be the problem. I’ve modified it and solved the issue. Thanks!