Example usage for java.lang Math cos

Introduction

In this page you can find the example usage for java.lang Math cos.

Prototype

@HotSpotIntrinsicCandidate
public static double cos(double a) 

Source Link

Document

Returns the trigonometric cosine of an angle.

Usage

From source file:MainClass.java

public static void main(String args[]) {
    double radians = 0.45 * Math.PI / 180;
    System.out.println("cos = " + Math.cos(radians));

}

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From source file:Main.java

public static void main(String[] args) {

    double x = 45.0;
    double y = 180.0;

    // convert them to radians
    x = Math.toRadians(x);// ww  w. j a v a  2  s . co  m
    y = Math.toRadians(y);

    // calculate their cosine
    System.out.println("Math.cos(" + x + ")=" + Math.cos(x));
    System.out.println("Math.cos(" + y + ")=" + Math.cos(y));

}

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From source file:MathTest.java

public static void main(String args[]) {
    int angles[] = { 0, 30, 45, 60, 90, 180 };
    for (int i = 0, n = angles.length; i < n; i++) {
        double rad = Math.toRadians(angles[i]);
        System.out.println("Angle: " + angles[i]);
        System.out.println(" Sine  : " + Math.sin(rad));
        System.out.println(" Cosine : " + Math.cos(rad));
        System.out.println(" Tangent: " + Math.tan(rad));
    }//from w  w  w . j  a  v a2s  . co m
}

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From source file:MainClass.java

public static void main(String args[]) {
    System.out.printf("Math.abs( 23.7 ) = %f\n", Math.abs(23.7));
    System.out.printf("Math.abs( 0.0 ) = %f\n", Math.abs(0.0));
    System.out.printf("Math.abs( -23.7 ) = %f\n", Math.abs(-23.7));
    System.out.printf("Math.ceil( 9.2 ) = %f\n", Math.ceil(9.2));
    System.out.printf("Math.ceil( -9.8 ) = %f\n", Math.ceil(-9.8));
    System.out.printf("Math.cos( 0.0 ) = %f\n", Math.cos(0.0));
    System.out.printf("Math.exp( 1.0 ) = %f\n", Math.exp(1.0));
    System.out.printf("Math.exp( 2.0 ) = %f\n", Math.exp(2.0));
    System.out.printf("Math.floor( 9.2 ) = %f\n", Math.floor(9.2));
    System.out.printf("Math.floor( -9.8 ) = %f\n", Math.floor(-9.8));
    System.out.printf("Math.log( Math.E ) = %f\n", Math.log(Math.E));
    System.out.printf("Math.log( Math.E * Math.E ) = %f\n", Math.log(Math.E * Math.E));
    System.out.printf("Math.max( 2.3, 12.7 ) = %f\n", Math.max(2.3, 12.7));
    System.out.printf("Math.max( -2.3, -12.7 ) = %f\n", Math.max(-2.3, -12.7));
    System.out.printf("Math.min( 2.3, 12.7 ) = %f\n", Math.min(2.3, 12.7));
    System.out.printf("Math.min( -2.3, -12.7 ) = %f\n", Math.min(-2.3, -12.7));
    System.out.printf("Math.pow( 2.0, 7.0 ) = %f\n", Math.pow(2.0, 7.0));
    System.out.printf("Math.pow( 9.0, 0.5 ) = %f\n", Math.pow(9.0, 0.5));
    System.out.printf("Math.sin( 0.0 ) = %f\n", Math.sin(0.0));
    System.out.printf("Math.sqrt( 900.0 ) = %f\n", Math.sqrt(900.0));
    System.out.printf("Math.sqrt( 9.0 ) = %f\n", Math.sqrt(9.0));
    System.out.printf("Math.tan( 0.0 ) = %f\n", Math.tan(0.0));
}

---

From source file:Main.java

public static void main(String[] args) {
    final int width = 512;
    final int height = 512;
    BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_4BYTE_ABGR);
    Graphics g = img.getGraphics();
    g.setColor(Color.black);//from w ww . jav a2  s  . c o  m
    g.fillRect(0, 0, width, height);
    g.setColor(Color.white);
    final double A = 8;
    final double B = 0.5;
    final double N = 4;
    final double scale = 128;
    final double zoom = 50;
    final double step = 1 / scale;
    Point last = null;
    final Point origin = new Point(width / 2, height / 2);

    for (double t = 0; t <= 2 * Math.PI; t += step) {
        final double r = zoom * polarFunction(t, A, B, N);
        final int x = (int) Math.round(r * Math.cos(t));
        final int y = (int) Math.round(r * Math.sin(t));
        Point next = new Point(x, y);
        if (last != null) {
            g.drawLine(origin.x + last.x, origin.y + last.y, origin.x + next.x, origin.y + next.y);
        }
        last = next;
    }

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add(new JLabel(new ImageIcon(img)));
    frame.pack();
    frame.setVisible(true);
}

---

From source file:edu.packt.neuralnet.som.Kohonen1DTest.java

public static void main(String[] args) {

    RandomNumberGenerator.seed = 0;//from  w ww. jav a  2  s  .  c  om

    int numberOfInputs = 2;
    int numberOfNeurons = 20;
    int numberOfPoints = 1000;

    double[][] rndDataSet = RandomNumberGenerator.GenerateMatrixBetween(numberOfPoints, numberOfInputs, -100.0,
            100.0);

    for (int i = 0; i < numberOfPoints; i++) {
        rndDataSet[i][0] = i;
        rndDataSet[i][0] += RandomNumberGenerator.GenerateNext();
        rndDataSet[i][1] = Math.cos(i / 100.0) * 1000;
        rndDataSet[i][1] += RandomNumberGenerator.GenerateNext() * 400;
    }

    Kohonen kn1 = new Kohonen(numberOfInputs, numberOfNeurons, new UniformInitialization(0.0, 1000.0), 1);

    NeuralDataSet neuralDataSet = new NeuralDataSet(rndDataSet, 2);

    CompetitiveLearning complrn = new CompetitiveLearning(kn1, neuralDataSet,
            LearningAlgorithm.LearningMode.ONLINE);
    complrn.show2DData = true;
    complrn.printTraining = true;
    complrn.setLearningRate(0.3);
    complrn.setMaxEpochs(10000);
    complrn.setReferenceEpoch(3000);
    try {
        String[] seriesNames = { "Training Data" };
        Paint[] seriesColor = { Color.WHITE };

        Chart chart = new Chart("Training", rndDataSet, seriesNames, 0, seriesColor, Chart.SeriesType.DOTS);
        ChartFrame frame = new ChartFrame("Training", chart.scatterPlot("X", "Y"));
        frame.pack();
        frame.setVisible(true);

        complrn.setPlot2DFrame(frame);
        complrn.showPlot2DData();
        System.in.read();

        complrn.train();
    } catch (Exception ne) {

    }
}

---

From source file:edu.packt.neuralnet.som.Kohonen2DTest.java

public static void main(String[] args) {

    RandomNumberGenerator.seed = System.currentTimeMillis();

    int numberOfInputs = 2;
    int neuronsGridX = 12;
    int neuronsGridY = 12;
    int numberOfPoints = 1000;

    double[][] rndDataSet;
    rndDataSet = RandomNumberGenerator.GenerateMatrixGaussian(numberOfPoints, numberOfInputs, 100.0, 1.0);
    //rndDataSet = RandomNumberGenerator.GenerateMatrixBetween(numberOfPoints, numberOfInputs, 100.0, 110.0);

    for (int i = 0; i < numberOfPoints; i++) {
        rndDataSet[i][0] *= Math.sin(i);
        rndDataSet[i][0] += RandomNumberGenerator.GenerateNext() * 50;
        rndDataSet[i][1] *= Math.cos(i);
        rndDataSet[i][1] += RandomNumberGenerator.GenerateNext() * 50;
    }/*from   w w  w  .  j  a v  a 2s.  co m*/

    //        for (int i=0;i<numberOfPoints;i++){
    //            rndDataSet[i][0]=i;            
    //            rndDataSet[i][0]+=RandomNumberGenerator.GenerateNext();
    //            rndDataSet[i][1]=Math.cos(i/100.0);            
    //            rndDataSet[i][1]+=RandomNumberGenerator.GenerateNext()*5;
    //        }        

    Kohonen kn2 = new Kohonen(numberOfInputs, neuronsGridX, neuronsGridY,
            new GaussianInitialization(500.0, 20.0));

    NeuralDataSet neuralDataSet = new NeuralDataSet(rndDataSet, 2);

    CompetitiveLearning complrn = new CompetitiveLearning(kn2, neuralDataSet,
            LearningAlgorithm.LearningMode.ONLINE);
    complrn.show2DData = true;
    complrn.printTraining = true;
    complrn.setLearningRate(0.5);
    complrn.setMaxEpochs(1000);
    complrn.setReferenceEpoch(300);
    complrn.sleep = -1;

    try {
        String[] seriesNames = { "Training Data" };
        Paint[] seriesColor = { Color.WHITE };

        Chart chart = new Chart("Training", rndDataSet, seriesNames, 0, seriesColor, Chart.SeriesType.DOTS);
        ChartFrame frame = new ChartFrame("Training", chart.scatterPlot("X", "Y"));
        frame.pack();
        frame.setVisible(true);
        //            //System.in.read();
        complrn.setPlot2DFrame(frame);
        complrn.showPlot2DData();
        //System.in.read();
        complrn.train();
    } catch (Exception ne) {

    }
}

---

From source file:TrigonometricDemo.java

public static void main(String[] args) {
    double degrees = 45.0;
    double radians = Math.toRadians(degrees);

    System.out.format("The value of pi is %.4f%n", Math.PI);
    System.out.format("The sine of %.1f degrees is %.4f%n", degrees, Math.sin(radians));
    System.out.format("The cosine of %.1f degrees is %.4f%n", degrees, Math.cos(radians));
    System.out.format("The tangent of %.1f degrees is %.4f%n", degrees, Math.tan(radians));
    System.out.format("The arcsine of %.4f is %.4f degrees %n", Math.sin(radians),
            Math.toDegrees(Math.asin(Math.sin(radians))));
    System.out.format("The arccosine of %.4f is %.4f degrees %n", Math.cos(radians),
            Math.toDegrees(Math.acos(Math.cos(radians))));
    System.out.format("The arctangent of %.4f is %.4f degrees %n", Math.tan(radians),
            Math.toDegrees(Math.atan(Math.tan(radians))));

}

---

From source file:Rotate45Degrees.java

public static void main(String[] args) {
    final Display display = new Display();

    final Image image = new Image(display, 110, 60);
    GC gc = new GC(image);
    Font font = new Font(display, "Times", 30, SWT.BOLD);
    gc.setFont(font);/*from   www.ja  va  2 s.  c  o  m*/
    gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
    gc.fillRectangle(0, 0, 110, 60);
    gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
    gc.drawText("SWT", 10, 10, true);
    font.dispose();
    gc.dispose();

    final Rectangle rect = image.getBounds();
    Shell shell = new Shell(display);
    shell.setText("Matrix Tranformations");
    shell.setLayout(new FillLayout());

    final Canvas canvas = new Canvas(shell, SWT.DOUBLE_BUFFERED);
    canvas.addPaintListener(new PaintListener() {
        public void paintControl(PaintEvent e) {
            GC gc = e.gc;
            gc.setAdvanced(true);
            if (!gc.getAdvanced()) {
                gc.drawText("Advanced graphics not supported", 30, 30, true);
                return;
            }

            // Original image
            int x = 30, y = 30;
            gc.drawImage(image, x, y);
            x += rect.width + 30;

            Transform transform = new Transform(display);

            // Rotate by 45 degrees 
            //float cos45 = (float)Math.cos(45);
            float cos45 = (float) Math.cos(Math.PI / 4);

            //float sin45 = (float)Math.sin(45);
            float sin45 = (float) Math.sin(Math.PI / 4);

            transform.setElements(cos45, sin45, -sin45, cos45, 0, 0);
            gc.setTransform(transform);
            gc.drawImage(image, 350, 100);

            transform.dispose();
        }
    });

    shell.setSize(350, 550);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    image.dispose();
    display.dispose();
}

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From source file:TrigonometricDemo.java

public static void main(String[] args) {
    double degrees = 45.0;
    double radians = Math.toRadians(degrees);

    System.out.println("The value of pi is " + Math.PI);
    System.out.println("The sine of " + degrees + " is " + Math.sin(radians));
    System.out.println("The cosine of " + degrees + " is " + Math.cos(radians));
    System.out.println("The tangent of " + degrees + " is " + Math.tan(radians));
    System.out.println("The arc sine of " + Math.sin(radians) + " is "
            + Math.toDegrees(Math.asin(Math.sin(radians))) + " degrees");
    System.out.println("The arc cosine of " + Math.cos(radians) + " is "
            + Math.toDegrees(Math.acos(Math.cos(radians))) + " degrees");
    System.out.println("The arc tangent of " + Math.tan(radians) + " is "
            + Math.toDegrees(Math.atan(Math.tan(radians))) + " degrees");
}

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