| T O P I C R E V I E W |
| bananas555 |
Posted - 06/05/2016 : 10:09:13 PM
I have a set of data that I've peak fitted with a custom equation using the non linear curve fitting tool.
When I enter this custom equation in the 2D function plot tool (with the exact same parameters), the output peak fit is not the exact same. I'm unsure as to why this is happening.
Any ideas? |
| 3 L A T E S T R E P L I E S (Newest First) |
| Echo_Chu |
Posted - 06/06/2016 : 10:11:18 PM
Would you mind sending us your project file so that we can further identify the problem?
You could follow the instructions below to send your file.
http://www.originlab.com/index.aspx?go=Support&pid=752
|
| bananas555 |
Posted - 06/06/2016 : 11:33:56 AM
Hi,
I've done exactly that, but still does not match up with the fitted result.
The fit from the 2D function plot tool appears to be smaller than the actual fit from the non linear curve fitting tool.
When I manually increase the area of the function in the 2D plot, it better matches the actual fitted data. I'm thinking that there is something that is subtracting or rescaling the area of the function in the 2D plot perhaps? |
| Echo_Chu |
Posted - 06/06/2016 : 02:20:38 AM
Hi,
We should pay attention to the coefficient values used in the 2D function plot tool. The number of significant digits used when copying the coefficient values may greatly alter the subsequent computation.
Could you try following steps in copying the parameter values from the fitting result?
1. Highlight the parameter values in the result sheet
2. Press Ctrl + Alt + C (It is to copy the values in full precision)
Then you can Ctrl + V to paste the values in full precission for the use in 2D funciton plot tool.
Echo
OriginLab Technical Support |
