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 Topic  |
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Sara_75
USA
6 Posts |
 Posted - 08/05/2015 : 01:45:54 AM
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Origin Ver. and Service Release (Select Help-->About Origin):
Operating System:
Hi Everyone,
Please help me with the following equation (Image attached):
I have experimental data y = f(x) and I need to do fitting of the data in order to determine the value of N.
Please help!
Thank you
Sara |
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jasonzhao
China
262 Posts |
Posted - 08/05/2015 : 02:36:35 AM
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Hello,
You mean the number N for exponent item is not a constant, so the fitting function is not fixed;
You first step is find a fixed fitting function,but not a fitting results, right?
How about E_k and A_k, do they have a constant value?
Best regards!
Jason
OriginLab Technical Service
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Sara_75
USA
6 Posts |
Posted - 08/05/2015 : 10:43:30 AM
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Hi Jason,
E_k and A_k are not constants, and the equation it is series of E_k, A_k. What I mean by my post is that I am trying to fit my experimental data with the equation attached in a way to determine the value of N required to get the best fit of my experimental data. I have tried N=3 (which means : y = y0+(E1*exp(-x/A1))+(E2*exp(-x/A2))+(E3*exp(-x/A3)) but didn't get good fit.
I am wondering if there is a way with OriginLab to find the value of N that will give best fit instead of trying each N value (N=4, N=5, N=6.....)
Thanks a lot!
Sara
quote:
Originally posted by jasonzhao
Hello,
You mean the number N for exponent item is not a constant, so the fitting function is not fixed;
You first step is find a fixed fitting function,but not a fitting results, right?
How about E_k and A_k, do they have a constant value?
Best regards!
Jason
OriginLab Technical Service
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Castiel
343 Posts |
Posted - 08/05/2015 : 11:46:47 AM
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quote:
Originally posted by Sara_75
Origin Ver. and Service Release (Select Help-->About Origin):
Operating System:
Hi Everyone,
Please help me with the following equation (Image attached):
I have experimental data y = f(x) and I need to do fitting of the data in order to determine the value of N.
Please help!
Thank you
Sara
It's more like FFT than curve fitting. Yet I'm afraid then it's NOT the N to determine.
c ȥ fuc c Τ c/
cʥ ' ̩ / թf
`
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Sara_75
USA
6 Posts |
Posted - 08/05/2015 : 3:57:15 PM
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Can you please explain more.Have tried to put an equation? I got this instead ????????
Thank you
quote:
Originally posted by Castiel
quote:
Originally posted by Sara_75
Origin Ver. and Service Release (Select Help-->About Origin):
Operating System:
Hi Everyone,
Please help me with the following equation (Image attached):
I have experimental data y = f(x) and I need to do fitting of the data in order to determine the value of N.
Please help!
Thank you
Sara
It's more like FFT than curve fitting. Yet I'm afraid then it's NOT the N to determine.
�c�� �ȥ� �f�u�c �c�� �Τ� �c/ ����
�c�ʥ� ���� �� �� ���' �̩��� /�� �թ��f
�� �� ���� �` �� ��
��
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Sara_75
USA
6 Posts |
Posted - 08/05/2015 : 6:09:01 PM
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I forgot to mention that E_k and A_k are adjusting parameters to fit the experimental data. E_k and A_k I could define them for N=3. I am more interested in defining the value of N to get better fit.
Thank you
quote:
Originally posted by Sara_75
Can you please explain more.Have tried to put an equation? I got this instead ????????
Thank you
quote:
Originally posted by Castiel
quote:
Originally posted by Sara_75
Origin Ver. and Service Release (Select Help-->About Origin):
Operating System:
Hi Everyone,
Please help me with the following equation (Image attached):
I have experimental data y = f(x) and I need to do fitting of the data in order to determine the value of N.
Please help!
Thank you
Sara
It's more like FFT than curve fitting. Yet I'm afraid then it's NOT the N to determine.
�c�� �ȥ� �f�u�c �c�� �Τ� �c/ ����
�c�ʥ� ���� �� �� ���' �̩��� /�� �թ��f
�� �� ���� �` �� ��
��
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jasonzhao
China
262 Posts |
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Sara_75
USA
6 Posts |
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jasonzhao
China
262 Posts |
Posted - 08/06/2015 : 02:24:42 AM
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Hello,
You can send data to tech@originlab.com for us to make a further check.
please mention this forum post link in the email.
Best regards!
Jason
OriginLab Technical Service |
Edited by - jasonzhao on 08/06/2015 02:25:56 AM |
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Sara_75
USA
6 Posts |
Posted - 08/06/2015 : 1:12:26 PM
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I did. Thank you
Sara
quote:
Originally posted by jasonzhao
Hello,
You can send data to tech@originlab.com for us to make a further check.
please mention this forum post link in the email.
Best regards!
Jason
OriginLab Technical Service
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Topic |
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Calculate factorial n in Loop function