Examples of DSP.fft.RDFT.evaluate()

DSP.fft.RDFT.evaluate()
Evaluates the DFT of a real sequence x. @param x double[] containing the real sequence in natural order. @param X double[] containing the transform of the sequence in conjugate symmetric packed form.

    double[] tmp       = new double[ nfft ];
    double[] transform = new double[ nfft ];
    double[] kernel    = new double[ nfft ];
    
    System.arraycopy( x, 0, tmp, 0, x.length );
    fft.evaluate( tmp, transform  );
    
    Arrays.fill( tmp, 0.0f );
    System.arraycopy( coefficients, 0, tmp, 0, coefficients.length );
    fft.evaluate( tmp, kernel );

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    System.arraycopy( x, 0, tmp, 0, x.length );
    fft.evaluate( tmp, transform  );
    
    Arrays.fill( tmp, 0.0f );
    System.arraycopy( coefficients, 0, tmp, 0, coefficients.length );
    fft.evaluate( tmp, kernel );
    
    RDFT.dftProduct( kernel, transform, 1.0f );
    fft.evaluateInverse( transform, tmp );
    
    // trim off trailing zeros

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