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 <newvi...@cars.uchicago.edu>
wrote:
> Hi Harry,
>
>
>
>
> On Fri, Aug 19, 2022 at 9:10 AM Andy Zhang <hzhang...@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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