| T O P I C R E V I E W |
| mohamed1986 |
Posted - 06/17/2014 : 12:49:30 PM
Origin Ver. and Service Release (Select Help-->About Origin): 9.1
Operating System: Win 7
Dear Friends,
Kindly, I have the attached equation, and I want to fit my x and y data to this equation to get the values of A and B
Could you please help me with that ?
y----------x
62.2040 361.9802
57.6240 360.6623
53.0280 359.0736
48.6790 356.8264
Thanks much
 |
| 4 L A T E S T R E P L I E S (Newest First) |
| mohamed1986 |
Posted - 06/19/2014 : 02:33:15 AM
Thanks much for your kind help
Best regards |
| lkb0221 |
Posted - 06/17/2014 : 3:22:29 PM
Hi,
I tried your function and looks working fine.
The A and B should be "parameters".
"Derived parameters" are additional parameters computed using the fitted parameter values, for example, FWHM in Gauss.
Zheng
OriginLab |
| mohamed1986 |
Posted - 06/17/2014 : 2:22:17 PM
Thanks much for your help.
I have written the equation to be:
A*(x^2)/(x-241)+84*B*((407-x^2-407*x)/(x*(407-x)^2))
I think that there is error with this expression.
Could you please tell me about the A and B parameters, shall I put them in parameters or derived parameters section knowing that both A and B are constant? |
| lkb0221 |
Posted - 06/17/2014 : 1:57:34 PM
Hi,
You can try to define a user-defined fitting function and do the fit.
http://www.originlab.com/doc/Origin-Help/UserDef-FitFunc
http://www.originlab.com/doc/Quick-Help/UserDefinedFittingFunction
Four points should be fine in your case for it only contains 2 parameters, but it will be better if you have more data for fitting.
Zheng
OriginLab |
