NLFitContext
The NLFitContext is derived from Analysis class and provide access to the information of the fitting function, as well as the current evaluation state that is generated by implementing the fitting function in Origin C. During non-linear fitting, the fitting function generally will return the corresponding y value for a particular x. However, when convolution and ODE (Ordinary Differential Equation) are involved, the entire curve should be considered, not only for a particular data point. NLFitContext class, which first introduced in Origin 8 SR2, can provide access to the key information with fitter.
For example, if we perform convolution while fitting, NLFitContext can help to monitor the fitted parameters in each iteration. Once they are updated, we can compute the convolution using the Fourier transform. The results can be saved in a defined vector. Then for each x, we can get the evaluated y from the vector with the current data index in NLSFCURRINFO.
EX1
| Please refer to Fitting with Convolution as example. |
EX2
| Please refer to Fitting with an Ordinary Differential Equation as example. |
EX3
| Please refer to Fitting with Convolution of Two Functions as example. |
ONLSF.h
| Name | Brief | Example |
|---|---|---|
| GetFitCurrInfo | It provides the information about the current evaluation state. See NLSFCURRINFO for more info. | Examples |
| GetIndepData | It provides the information about the independent data being fitted. | Examples |
| GetSourceDataRange | It provides a way to access source XY DataRange. | Examples |
| GetNumDatasetSets | It provides the information about the number of dataset sets being fitted. | Examples |
| IsNewParamValues | Whenever evaluation of values of a fitting function are needed for a new set of parameter values, an internal flag 'new parameter values' is set. | Examples |
| NLFitContext | Constructor of the class. | |
| ~NLFitContext | Destructor of the class. |