[Ifeffit] third cumulant in Larch

[Andy Zhang]

Hi Matt,

Thank you very much for your email! I did not add it to the Path in my
previous fit. I modified the file based on your email and now it works.

Many thanks for your help and have a nice day!

Best,
Harry

On Fri, Aug 19, 2022 at 7:35 PM Matt Newville <newville at cars.uchicago.edu>
wrote:

> Hi Harry,
>
>
>
>
> On Fri, Aug 19, 2022 at 9:10 AM Andy Zhang <hzhangcat at gmail.com> wrote:
>
>> Dear all,
>>
>> I have a quick question related to EXAFS fitting using Larch. I wonder
>> how to include the third cumulant in the fitting. I tried to add "third" in
>> the "pars" section, but it seems it did not work.
>>
>> [image: image.png]
>>
>> Thanks a lot for your help!
>>
>>
> By itself, that just sets up the parameters to be varied during the fit.
> It does not specify how those will be used.
>
> So: did you use the parameter named "third" in any of the Path Parameter
> definitions?  Something like this
>
>      path1 = feffpath('feff0001.dat',   s02 = 'amp', e0 = 'del_e0',
>  sigma2='sigma2_eins(300, theta)',
>                                deltar='alpha*reff',
>                                third='third')
>
> should work.
>
> If not, please post a complete, minimal example showing what you are doing.
>
> --Matt
>
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