PreprocessingModulesExamples/DerivativeExample/DerivativeExample.cpp

/*
 GRT MIT License
 Copyright (c) <2012> <Nicholas Gillian, Media Lab, MIT>
 
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/*
 GRT Derivative Example
 This example demonstrates how to create and use the GRT Derivative PreProcessing Module.
 
 The Derivative module computes either the first or second order derivative of the input signal. 
 
 In this example we create two Derivative instances, one to compute the first derivative of the
 input signal and another to compute the second derivative of a 1-dimensional input signal.
 
 We then create a sine-wave signal as the input signal to both Derivative instances, the sine signal
 and first and second derivative signals are then output to std::cout.
 
 This example shows you how to:
 - Create a new Derivative instance to compute either the first or second derivative
 - Compute the (1st and 2nd) derivative of a sine-wave signal
 - Save the Derivative settings to a file
 - Load the Derivative settings from a file
*/

//You might need to set the specific path of the GRT header relative to your project
#include <GRT/GRT.h>
using namespace GRT;
using namespace std;

int main (int argc, const char * argv[])
{

    //Create a new Derivative instance and set it to compute the first order derivative
    Derivative deriv1(Derivative::FIRST_DERIVATIVE);
    
    //Create another new Derivative instance and set it to compute the second order derivative
    Derivative deriv2(Derivative::SECOND_DERIVATIVE);
    
    //Generate some data (sine wave) and compute the derivative of this
    double x = 0;
    const UINT M = 1000;
    Random random;
    for(UINT i=0; i<M; i++){
        double signal = sin( x );
        
        double deriv1Value = deriv1.computeDerivative( signal );
        double deriv2Value = deriv2.computeDerivative( signal );
        
        cout << signal << "\t" <<deriv1Value << "\t" << deriv2Value << endl;
        
        x += TWO_PI/double(M)*10;
    }
    
    //Save the derivative settings to a file
    deriv1.save("Derivative1Settings.grt");
    deriv2.save("Derivative2Settings.grt");
    
    //We can then load the settings later if needed
    deriv1.load("Derivative1Settings.grt");
    deriv2.load("Derivative2Settings.grt");

    return EXIT_SUCCESS;
}