fit function norm indices.

Hi John - 

I noticed that I had a user model whose norm params were NOT all being
normed.  So I did a quick test:

  isis> define dummy_fit(){ return 1; }
  isis> add_slang_function("dummy", ["a","b","c"], [0:2] ); 
  Norm indices must be numbered from 1 <= n <= N


My normed params were 15:40 (from list_par), but 40 was not being
normed. In my function, I assumed array indices of 14:39.  On the
other end, the wrong kind of parameter was being used as a norm.  So I
never generated the error.  (Hopefully, this will explain some edge
effects in my models.)

I think the help file should state that the indices are NOT array
indices, but the logical parameter indices, starting at 1:

    "The optional third argument, norm_indexes, is an integer array
    specifying the indices of the parameters which should be
    interpreted as normalization coefficients."

This is ambiguous, since the parameters are also in slang arrays.  An
explicit example might make proper use clear.

Thanks for the error message, though, which helped track this down
easily.

-- Dave

David Huenemoerder (617-253-4283; fax: 253-8084)
MIT Center for Space Research/Chandra X-ray Center
70 Vassar St., NE80-6023,
Cambridge, MA  02139
[Admin. Asst.: Elaine Tirrell, 617-253-7480, egt_at_email.domain.hidden----
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