2.1.23.2.12 ocmath_find_peaks_partition

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

Description

Find two inflexions determined by smoothed 2nd derivative on the nearest left and right of dPeakCenter, and then use nStartofPeak and nEndofPeak to record the two inflexions indices. nStartofPeak and nEndofPeak determined the peak's partition.

Syntax

int ocmath_find_peaks_partition( UINT lSize, const double * px, const double * py, double dPeakCenter, int * nStartofPeak, int * nEndofPeak, int nPtsSmooth )

Parameters

lSize: [input] size of px, py
px: [input] it contains curve's X coordinate's datas
py: [input] it contains curve's Y coordinate's datas
dPeakCenter: [input] X coordinate's data of peak's center
nStartofPeak: [output] pointer to the start indice of peak
nEndofPeak: [output] pointer to the end indice of peak
nPtsSmooth: [input] the number of smooth points

Return

Return OE_NOERROR if succeed, otherwise, non-zero error code is returned.

Examples

EX1

//Assume in the current graph, curve's XY data is in the first data plot. This piece
//of code get the XY data of the curve from the first data plot and find the peaks.
void ocmath_find_peaks_partition_ex1()
{
    GraphLayer gl = Project.ActiveLayer();
    if (!gl)
    {
        return;
    }
 
    //get data from the first dataplot
    DataPlot dp = gl.DataPlots(0);        
    DataRange dr;
    vector vxData, vyData;
    if(dp.GetDataRange(dr))
    {
        DWORD dwPlotID;
        if(dr.GetData(DRR_GET_DEPENDENT | DRR_NO_FACTORS, 0, &dwPlotID, NULL, &vyData, &vxData) < 0)
        {
            printf("get_plot_data failed GetData");
            return;
        }
    }
 
    uint lSize = vxData.GetSize();
    int nStart, nEnd;
    double dPeak=4;
    int nPtsSmooth=11;
    int nRet = ocmath_find_peaks_partition(lSize, vxData, vyData, dPeak,&nStart,&nEnd, nPtsSmooth);
    if( nRet < OE_NOERROR )
    {
        printf("error code: %d\n", nRet);
        return;
    }
}