Re: modeling question

On Jul 29, 2009, at 2:47 AM, Manfred Hanke wrote:

> Herbert Pablo wrote:
>> So, I was trying your method and I ran into a little snag at step  
>> 4:  newdata = get_model_counts(1);  % You are getting the counts from
>> the model you just fit
>> I get the following error message:
>> Unable to typecast Null_Type to Double_Type
>
> Are you sure that you have *just* fit your model?
> At first sight, it seemed to me that you might not have evaluated  
> your model yet (if you did a new startup of ISIS and only  
> load_par'ed your parameter file). ISIS doesn't evaluate the model  
> every time you do a {plot,get}_model_{counts,flux}, but stores it  
> internally. If one hasn't *just* fit the model, one has to do at  
> least an
>   ()=eval_counts();
> to evaluate the model on the grid(s) defined by the data.
>
> However, I cannot reproduce your error with the situation described  
> above (with ISIS >=1.4.9-55). Which version of ISIS and S-Lang are  
> you using?

Actually, we figured it out.  get_model_counts returns NULL for  
the .err field of the structure, so that needs to be filed in before  
doing the define_counts.

-Mike


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