| T O P I C R E V I E W |
| Semipolar |
Posted - 03/25/2010 : 09:13:46 AM
I am not familiar with OriginPro8. Now I would like to fit using this equation I(T)= I0/[1+C exp(-E0/KT)]; for temperature dependence of PL intensity. But I do not know which one I have to put for dependent and parameter names. I want to know the E0 result from this equation. If someone knows, please teach me.
Thanks a lot. |
| 1 L A T E S T R E P L I E S (Newest First) |
| greg |
Posted - 03/25/2010 : 5:36:52 PM
Presumably you have measurements of I (the Dependent variable - typically the Y column) at specified Temperatures (the Independent variable - typically the X column).
In the Function Organizer, set
Independent Variable : T
Dependent Variable : I
Parameter Names : I0,C,E0,K
Function : I = I0 / (1+C*exp(-E0/K*T))
Also, for User-defined functions you must supply some initial parameter values. If you do not know good values, you can try 1, but 'bad' values may make fitting difficult. For example, enter this in the Parameter Initialization box :
I0 = 1;
C = 1;
E0 = 1;
K = 1;
If parameter values are really poor guesses then start your fitting with the Simplex method.
All names are case sensitive. |
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