2.2.1.2.10 NLFitSession::ParamsInitValues

ParamsInitValues

1 Description
2 Syntax
3 Parameters
4 Return
5 Examples
6 Remark
7 See Also
8 Header to Include

Description

Initialize parameters by parameter initialization code in FDF file.

Syntax

bool ParamsInitValues(bool bRunParamInit = true, DWORD dwInitCtrl = 0, int nFunc = -1)

Parameters

bRunParamInit: [input] if true will run parameter initializetion code, else the parameter value will be the default value defined in FDF file.
dwInitCtrl: [input] can be 0 to specify nothing. The enum like NLF_FUNC_CHANGE, NLF_RESET_SHARE_FIX, NLF_KEEP_OLD_DATASET.
nFunc: [input] the index of function, -1 for all functions. To specify initialize the parameters of which function.

Return

return ture if set function successfully.

Examples

EX1

Prior to running the following example, the nlsf_utils.c file need to be loaded and compiled. This can be done from script with the command run.LoadOC(Originlab\nlsf_utils.c) or just add this file to your workspace.
New a worksheet and import \Samples\Curve Fitting\Gaussian.dat.
Copy and compile the following codes, and run "NLFitSession_ParamsInitValues_ex" in Command window.

#include <..\originlab\NLFitSession.h> 
void NLFitSession_ParamsInitValues_ex()
{
    Worksheet wks = Project.ActiveLayer();
    if( !wks )
        return;
    
    XYRange dr;
    dr.Add(wks, 0, "X");
    dr.Add(wks, 1, "Y");
    dr.Add();
    dr.Add(wks, 0, "X");
    dr.Add(wks, 2, "Y");
    
    vector vX1, vY1, vX2, vY2;
    dr.GetData(vY1, vX1, NULL, 0);
    dr.GetData(vY2, vX2, NULL, 1);
    
    int nNumDataset = dr.GetNumData(DRR_GET_DEPENDENT);
    
    NLFitSession    FitSession;    
    if( !FitSession.SetFunction("Gauss")) // set function as Gauss, category name can be ignore
    {
        out_str("invalid fit function");
        return;
    }    
    
    // set first dataset
    if( !FitSession.SetData(vY1, vX1, NULL, 0, nNumDataset))
    {
        out_str("fail to set data");
        return;
    }   
    
    // set second dataset
    if( !FitSession.SetData(vY2, vX2, NULL, 1, nNumDataset))
    {
        out_str("fail to set data");
        return;
    }   
    
    if( !FitSession.ParamsInitValues())
    {
        out_str("fail to initialize parameters");
        return;
    }   
    
    out_str("Parameter initialized successfully!");
    
    // get parameter values after initialization
    vector      vParamValues;
    vector<int> vnParamsOffsets; // the begin index of one group of parameters, normally one group for one dataset
    FitSession.GetParamValuesAndOffsets(vParamValues, vnParamsOffsets);
    
    // output parameter values with names
    vector<string> vsParamNames;
    FitSession.GetParamNamesInFunction(vsParamNames);
    
    for(int nDataset = 0; nDataset < nNumDataset; nDataset++)
    {
        printf("---The parameters of data %d---\n", nDataset+1);
        
        for( int nParam = vnParamsOffsets[nDataset], ii = 0; nParam < vnParamsOffsets[nDataset+1]; nParam++, ii++ )
        {
            printf("%s = %f\n", vsParamNames[ii], vParamValues[nParam]);
        }
    }   
}