Re: loading etable models in ISIS

On Tue, Jun 14, 2011 at 10:48 +0530, gulabd_at_email.domain.hidden>
>  Hi,
>
>       I am trying to load an xspec-style etable model in isis-1.6.1-39 with the command add_etable_model.
> This command exists but does not load.
>
>  isis> add_etable_model ;
> add_etable_model: Function did not autoload
>
> Any help?
>
> -gulab
> ----

Hi Gulab,

The short answer is that the etable model interface no longer
exists. The autoload for add_etable_model should also have been
removed, but I overlooked it.

As a workaround, can you load your etable model as an mtable
and then evaluate the exponential as part of the model
expression?  For example:

    add_mtable_model (file, "yourmodel")
    fit_fun ("... exp(yourmodel(1)) ... ");

Here's a fuller explanation:

To evaluate xspec table models, isis uses the relevant
functions provided by the xspec subroutine library.

The xspec11 subroutine library provided three such functions to
support additive, multiplicative, and exponential table models,
so isis provided interfaces for all three.

Early after the transition to xspec12, xspec12 provided no
table model interface at all, so isis continued to support
table models using the three xspec11 library functions.

Now that the Xspec12 subroutine library again provides
functions to evaluate table models, isis has switched to the
new interface. However, only the additive and multiplicative
models are supported.  No etable function is provided, so isis
no longer provides an etable interface.

Nevertheless, I think etables should still be usable with the
above workaround.  Does that work with your model?

Thanks,
-John
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