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 Exponential fitting with convolution		  New Topic  Reply to Topic
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photongirl

Germany
2 Posts
Posted - 09/08/2017 :  10:42:23 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Pro 2017G, SR2 (64bit)
Operating System: Windows 8 (64bit)

Hi,
I have worked trough this tutorial and it works perfectly fine with the sample data provided.
http://www.originlab.de/doc/Tutorials/Fitting-Convolution

But when I try to use my own data, it doesn't work. The fit is nowhere near the data. What am I missing?

I have already tried:
-cutting off chunks of (almost zero) data from the response data before and after the response peak
-shifting the response data on the x-axis so that its peak aligns with the peak of the output signal
-shifting signal data on the y-axis such that it aligns with the response data at y=0
-increasing the initial parameter value of A=7000

Any hints would be greatly appreciated!




Edit: I shifted the response (IRF) a little better, now the fit seems better, but the fit report says that the fit didn't converge. What can I do better?
Edited by - photongirl on 09/08/2017 12:07:23 PM

easwar

USA
1964 Posts
Posted - 09/08/2017 :  12:04:51 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi photongirl,

Perhaps a two-term exponential function will work better with your data. Also try removing (or masking) the far right end of the data where it drops abruptly.

We are happy to try if you can send us your raw data and your response function data. Please send your file to tech@originlab.com and mention this post in your e-mail.

Easwar
OriginLab
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photongirl

Germany
2 Posts
Posted - 09/08/2017 :  12:28:37 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thank you easwar, I have now sent an email.
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Solanraul

Spain
1 Posts
Posted - 09/13/2017 :  09:25:57 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
You can also try matlab to check it.

Owner in https://www.lacestitadelbebe.es
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