EVALFIT-Evaluate fit results.

Usage:

evalfit in out comp=?

Description:

This routine turns components in the result structure of the Specdre Extension into a fake data set representing those results. Such a data set is necessary to perform arithmetic operations between the result (otherwise expressed only as a set of parameters) and the original data.

Parameters:

INFO

INFO = _LOGICAL (Read) If false, this routine will issue only error messages and no informational message. [YES]

DIALOG

DIALOG = _CHAR (Read) If 'T', the routine can evaluate several sets of components. After a set of components has been evaluated, the user will be asked whether she wants to specify another set. ['T']

IN

IN = NDF (Read) The input NDF. This must be a base NDF. If you need only a section of an NDF, you use SUBSET first to create the section permanently.

OUT

OUT = NDF (Read) The output NDF.

COMP

COMP = _INTEGER (Read) The numbers of up to 6 components to be added into the output data component. If you are not sure which component is which, you should inspect the result structure of the data first with EDITEXT.

REPLY

REPLY = _LOGICAL (Read) Set true to work on another set of components. This parameter is relevant only if DIALOG is true. [NO]

Examples:

evalfit in out comp=[2,5,1,2] accept
   This will take the input NDF IN and create an equally shaped
   NDF called OUT. The specified components stored in IN's (and
   OUT's) Specdre Extension are evaluated and added up to make up
   the main data in OUT. Note that component no. 2 is added twice.

Source comments:

   E V A L F I T

   The routine takes as input a base NDF (a section is not
   acceptable). The output is a copy of the input, except for the
   main NDF data and variance components. These are re-calculated from
   certain components in the result structure of the Specdre
   Extension. Thus the output contains the fit results both in the
   result structure and in the main NDF. The main NDF can then be
   compared pixel by pixel with the original data.

   If the input main NDF has a variance component, the output
   variances will be set to zero.

   This routine recognises result components created by FITCHEBY (the
   precursor of FITPOLY), FITGAUSS, FITPOLY, or FITTRI. Unrecognised
   components are ignored, i.e. not added into the data. A warning to
   that effect is given.
   If a component in any particular position has bad values as
   parameters, then that component is ignored on that position. No
   warning to this effect is given.

   A component is accepted as 7th order series of Chebyshev
   polynomials if the component type is 'Chebyshev series' and it has
   11 parameters. These are assumed to be order, xmin, xmax, coeff0,
   ... coeff7.

   A component is accepted as 7th order polynomial if the component
   type is 'polynomial' and it has 9 parameters. These are assumed to
   be order, coeff0, ... coeff7.

   A component is accepted as Gauss or triangle if the component type
   is 'Gauss' or 'triangle' and it has 4 parameters. The first three
   are assumed to be centre, peak, FWHM.

   The string comparison to check the component type is
   case-insensitive.

Notes:

This routine recognises the Specdre Extension v. 0.7.