| Re: IDL Virtual Machine information [message #35714 is a reply to message #35623] |
Mon, 30 June 2003 10:47  |
kashyap
Messages: 26
Registered: April 1993
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Junior Member |
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In article <bdp94e$jfg$1@houston.jhuapl.edu>,
Haje Korth <haje.korth@jhuapl.edu> wrote:
> which is not available in VM mode. This seems to be used by many people,
> even though I haven't discovered its usefulness. (Maybe someone could
> describe a scenario, where I really need this and cannot find a quick
> workaround. Maybe I have been missing out on something great here.)
>
> Greetings,
> Haje
Here is an example:
http://hea-www.harvard.edu/PINTofALE/pro/fitting/adjustie.pr o
(which is part of the PINTofALE suite, see
http://hea-www.harvard.edu/PINTofALE/doc/FITLINES.howto )
We use EXECUTE() to define constraints among fit parameters. Given
the large number of possible constraints, there is no other way to
set up a flexible constraint at run time. For instance, one might
come across a constraint such as "flux in line 2 is between 2 and 3
times the flux in line 1." Or, "line 2 is at a fixed distance from
line 1, with some error." Or, "if line 1 has flux greater than some
threshold then line 2 is located at this position, otherwise at this
other, slightly different, position." Etc.
Vinay
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