[Ifeffit] error message for Set: equation

[dmc at pdx.edu]

It just gives me the old box with :  "there are errors in your math expression.
                                      Do you wish to abort or carry on..." 

I clicked on "abort," then defined the parameter and it worked fine. 
   
--Dan 


Quoting Bruce Ravel <ravel at phys.washington.edu>:

> On Tuesday 17 August 2004 03:02 pm, dmc at pdx.edu wrote:
> > Also, don't forget you have to "define" when using equations, I got
> > an error message when I used "set."
> 
> Which error message did you get?  Since last week's business about
> setting the feff executable correctly, I have started examining
> artemis's error/warning/informational messages and changing some that
> seemed vague to me.
> 
> I also wanted to point out the difference between set and def in
> Ifeffit, which may help to explain whatever the message was.
> 
> In Ifeffit, a set parameter is evaluated once when the command is
> issued to Ifeffit.  A def parameter is parsed and it's math expression
> is stored.  As the fit progresses, the math expression is re-evaluated
> to be kept up to date with the current values of the guess
> parameters.  A set, on the other hand, does not change during the
> course of the fit.
> 
> HTH,
> B
> 
> -- 
>  Bruce Ravel  ----------------------------------- ravel at phys.washington.edu
>  Code 6134, Building 3, Room 405
>  Naval Research Laboratory                          phone: (1) 202 767 2268
>  Washington DC 20375, USA                             fax: (1) 202 767 4642
> 
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>  Brookhaven National Laboratory, Upton, NY 11973
> 
>  My homepage:    http://feff.phys.washington.edu/~ravel 
>  EXAFS software: http://feff.phys.washington.edu/~ravel/software/exafs/
> 
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