| T O P I C R E V I E W |
| wmm265 |
Posted - 04/26/2018 : 12:53:20 PM
Hi,
I'm trying to globally fit my data (two curves) to obtain shared parameters using two different user-defined equations.
They are:
y=R2a+rex*(1-(((4*x)/kex)*tanh(kex/(4*x))))
and
y=R2b +1.78*rex*(1-(((4*x)/kex)*tanh(kex/(4*x))))
In the equations I float rex, kex, and R2a/b. Each equation fits one curve.
I'm not sure how to do this in origin. Any help would be appreciated |
| 3 L A T E S T R E P L I E S (Newest First) |
| arstern |
Posted - 04/27/2018 : 12:23:19 PM
Hi William,
To conduct nonlinear fitting on specific columns, you will want to select your X column and Two Y columns in the worksheet i.e. L3 and L4 then Select Analysis -> nonlinear curve fitting ....
To select specific columns in the worksheet -> Select your first column then hold the CTRL button as you select your other columns.
-Aviel
|
| wmm265 |
Posted - 04/26/2018 : 4:37:58 PM
Hi Aviel,
Thanks for the link. It was helpful. It looks like this is really good if you have only two y-columns to fit. In this example it was L1 and L2. What if you had many more like L1-L100, and you only wanted to fit two columns at a time (i.e L3 and L4, then L5 and L6) instead of fitting one parameter for all of the data?
William |
| arstern |
Posted - 04/26/2018 : 2:14:29 PM
Hi,
Please see if this tutorial is helpful:
https://www.originlab.com/doc/Tutorials/Multi-Functions-Global-Fitting
Thanks,
Aviel
OriginLab |
