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cfenoglio

1 Posts
Posted - 07/03/2018 :  07:09:59 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 8 v8.0724
Operating System: Windows 7

Hi! Im new to origin, want to fit my data to this equation but always get de fit dont converge message

y = y0*exp(-kd*t)+ypre*kf*(exp(-kd*t)-exp(-kf*t))/(-kd+kf)

y: dependent variable
t: independent variable

parameters: y0, ypre, kd, kf

arstern

USA
237 Posts
Posted - 07/03/2018 :  08:54:30 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

I would recommend checking your parameters. Make sure that the values in the initial parameters makes sense.

Here is some documentation as well on why a fit does not converge:
https://www.originlab.com/doc/Origin-Help/The_Reason_Why_Fail_to_Converge

https://www.originlab.com/doc/Origin-Help/NLFit-Result-FitStatusCode

Aviel
OriginLab
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cc261

22 Posts
Posted - 09/01/2018 :  06:12:28 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
try a software named 1stOpt, no guess of initial parameters is required.
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