Example usage for org.apache.commons.math3.complex ComplexUtils convertToComplex

Introduction

In this page you can find the example usage for org.apache.commons.math3.complex ComplexUtils convertToComplex.

Prototype

public static Complex[] convertToComplex(double[] real) 

Source Link

Document

Convert an array of primitive doubles to an array of Complex objects.

Usage

From source file:jurbano.melodyshape.comparison.bspline.Laguerre.java

protected Complex[] findAllComplexRoots(PolynomialFunction f) {
    // This call to super.setup is the change we need in the Laguerre
    // implementation from the Apache Commons Math library. Need to set
    // up the maximum number of iterations and the bounds 0 and 1.
    // The original implementation had the maximum number of iterations set
    // to Integer.MAX_VALUE
    super.setup(this.maxIterations, f, 0, 1, 0);
    return this.solver.solveAll(ComplexUtils.convertToComplex(f.getCoefficients()), new Complex(0, 0d));
}

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From source file:tw.edu.sju.ee.eea.module.iepe.file.IepeSpectrumElement.java

private JFreeChart createChart() {
    XYSeries series = new XYSeries("Ch_0");

    try {/*w  w w.j a  v  a  2 s  .c om*/
        ValueInputStream vi = new ValueInputStream(info.getInputStream());
        vi.skip(info.getCursor().getIndex() / 8);
        double[] value = new double[1024 * 16];
        for (int i = 0; i < value.length; i++) {
            value[i] = vi.readValue();
        }

        FastFourierTransformer fft = new FastFourierTransformer(DftNormalization.STANDARD);
        Complex[] data = ComplexUtils.convertToComplex(value);
        Complex[] transform = fft.transform(data, TransformType.FORWARD);
        int max = transform.length / 2 + 1;
        for (int i = 1; i < max; i++) {
            double f = (double) i * info.getSamplerate() / transform.length;
            series.add(f, transform[i].abs() / value.length * 2);
        }

    } catch (FileNotFoundException ex) {
        Exceptions.printStackTrace(ex);
    } catch (IOException ex) {
    }

    XYSeriesCollection collection = new XYSeriesCollection();
    collection.addSeries(series);

    BodePlot bodePlot = new BodePlot("Spectrum");
    bodePlot.addData(0, "Magnitude(dB)", collection);
    bodePlot.getXYPlot().getRangeAxis().setRange(0, 500);
    bodePlot.getXYPlot().getDomainAxis().setRange(0.5, 10000);
    return bodePlot;
}

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