Re: Analytic fortran model

On Fri, Feb 07, 2014 at 16:03 -0430, Efrain Gatuzz wrote:
> Hi,
> 
> I wrote an x-ray interstellar absorption model with Fortran90
> in order to fit high-resolution spectra. The model uses several
> atomic-data files. The code includes a "startup process" such
> that the model reads the atomic data each time a new spectra is
> added.  The "startup process" depends on IFL (the XSPEC
> parameter which specifies which dataset is been used). However
> when I tried to use the model on ISIS the program never reads
> the atomic-data. Does ISIS use the IFL parameter as XSPEC uses?
> or should I write a new code for ISIS? In the second case, What
> is the parameter that indicates that a new dataset is added in
> ISIS?
> 

Isis does not use xspec's IFL parameter.

Why is it necessary to read the atomic data each time a new
spectrum is added?  If the atomic data is the same for every
dataset, wouldn't it be better to read the data just once when
the model is initialized?  

In isis, there is no parameter that indicates that a new
dataset has been loaded, mainly because there's never been any
need for such a parameter.  It is, however, possible to define
a "hook" function that executes whenever the load_data function
is used. For details, see the help page for 'load_data'.

Thanks,
-John
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