2.1.11.3 nlfFit

Description

Get the value of the specified dependent variable for the specified value of the independent variable.

Syntax

double nlfFit( double dx, int nDepend = 0 )

Parameters

dx

[input] value of the independent variable

nDepend

[input] dependent variable ( 0 based offset)

Return

Returns the value of the specified dependent variable for the given value of the independent variable.

Examples

EX1

bool LTNLSF_fit(curvebase& crvData, vector& fitx, vector& fity, int i1, int i2, LPCSTR lpcszFunc)
{
    int nMissing, nSrcOffset;
    Curve cvcpy(crvData, nMissing, nSrcOffset, CURVECOPY_SKIP_MISSING_INSIDE, i1, i2);
    
    using NLSF = LabTalk.NLSF;
    NLSF.Init();                    // initialize fitter
    
    NLSF.Func$ = lpcszFunc;
    NLSF.Output(0);
    NLSF.FitData$ = cvcpy.GetName();  
    NLSF.Execute("parainit");        // perform auto parameter initialization
    NLSF.Iterate(100);
    NLSF.End(13);
    
    Dataset cvcpyx;
    cvcpy.AttachX(cvcpyx);
    fitx = cvcpyx;
    fity = nlfFit(fitx); // get fit Y values given X values, using Origin C vector mechanism with functions with double argument
    return true;
}

void test(int i1 = 0, int i2 = -1, string strFunc = "Gauss", string strRwks = "FitCurve")
{
    Worksheet wksData = Project.ActiveLayer();
    Curve crvData(wksData, 0, 1);
    if(!crvData)
        return;
    
    vector vx, vy;    
    LTNLSF_fit(crvData, vx, vy, i1, i2, strFunc);
    
    Worksheet wksResult(strRwks);
    if(!wksResult)
    {
        wksResult.Create();
        wksResult.GetPage().Rename(strRwks);
    }
    Dataset fitdx(wksResult, 0);
    Dataset fitdy(wksResult, 1);
    fitdx = vx;
    fitdy = vy;
}

Remark

Get the value of the specified dependent variable for the specified value of the independent variable. This function is used in conjunction with the internal Origin Non-linear Least Squares Fitter (NLSF) object and uses the most recent fitting function and parameter values specified through the NLSF interface or through script.

See Also

Header to Include

origin.h

Reference