Version Info

Minimum Origin Version Required: Origin 8 SR0

Continuous Wavelet Transformation (CWT)

This example shows how to access NAG continuous wavelet transformation routines to calculate the wavelet coefficients.

#include <oc_nag.h>
#include  <nag\OC_nag_ex.h>

void cwt_ex()
        // pick input data from worksheet for CWT calculation
        Worksheet wks = Project.ActiveLayer();
        if( !wks || wks.GetNumCols() < 2 )
                printf("Please make sure a worksheet is active with two columns.\n");     
        Dataset dsSignal(wks, 0);  // assume that the first column is signal data
        Dataset dsScale(wks, 1); // the second column is scale data
        int nSignal = dsSignal.GetSize();
        int nScale = dsScale.GetSize();
        // copy the data from columns to vectors
        vector vSignal(nSignal);
        vector<int> vnScale(nScale);
        vSignal = dsSignal; 
        vnScale = dsScale; 
        // prepare the parameters for NAG cwt routine
        // types of wavelet can be used:  Nag_Morlet, Nag_DGauss, Nag_MexHat
        Nag_WavType nagType = Nag_Morlet;  
        int nWavePara  = 5;
        static NagError fail; 
        matrix mat(nScale, nSignal);
        nag_cwt_real(nagType, nWavePara, nSignal, vSignal, nScale, vnScale, mat, &fail);
        if(fail.code != NE_NOERROR) //examine error if there is
        // prepare the output matrixbook for the matrix coefficient
        MatrixLayer ml;        
        ml.Create("Origin");  // create new matrix layer with default template named "Origin"
        // set the number of rows and columns and XY range for matrix window
        MatrixObject mo = ml.MatrixObjects(0); 
        mo.SetSize(nScale, nSignal);
        mo.SetXY(0, 0, nSignal - 1, nScale - 1);
        // copy result from mat variable to the matrix window
        matrix& matData = mo.GetDataObject();      
        matData = mat;