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 wrote:

Hi Harry,

On Fri, Aug 19, 2022 at 9:10 AM Andy Zhang 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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