org.jfree.data.function.LineFunction2D Java Examples

The following examples show how to use org.jfree.data.function.LineFunction2D. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: ScatterPlotPanel.java    From snap-desktop with GNU General Public License v3.0 6 votes vote down vote up 
private XYIntervalSeries computeRegressionData(double xStart, double xEnd) {
    if (scatterpointsDataset.getItemCount(0) > 1) {
        final double[] coefficients = Regression.getOLSRegression(scatterpointsDataset, 0);
        final Function2D curve = new LineFunction2D(coefficients[0], coefficients[1]);
        final XYSeries regressionData = DatasetUtilities.sampleFunction2DToSeries(curve, xStart, xEnd, 100, "regression line");
        final XYIntervalSeries xyIntervalRegression = new XYIntervalSeries(regressionData.getKey());
        for (int i = 0; i < regressionData.getItemCount(); i++) {
            XYDataItem item = regressionData.getDataItem(i);
            final double x = item.getXValue();
            final double y = item.getYValue();
            xyIntervalRegression.add(x, x, x, y, y, y);
        }
        return xyIntervalRegression;
    } else {
        Dialogs.showInformation("Unable to compute regression line.\n" +
                                        "At least 2 values are needed to compute regression coefficients.");
        return null;
    }
}
Example #2
Source File: DatasetUtilitiesTest.java    From openstock with GNU General Public License v3.0 5 votes vote down vote up 
/**
 * Some checks for the sampleFunction2D() method.
 */
@Test
public void testSampleFunction2D() {
    Function2D f = new LineFunction2D(0, 1);
    XYDataset dataset = DatasetUtilities.sampleFunction2D(f, 0.0, 1.0, 2,
            "S1");
    assertEquals(1, dataset.getSeriesCount());
    assertEquals("S1", dataset.getSeriesKey(0));
    assertEquals(2, dataset.getItemCount(0));
    assertEquals(0.0, dataset.getXValue(0, 0), EPSILON);
    assertEquals(0.0, dataset.getYValue(0, 0), EPSILON);
    assertEquals(1.0, dataset.getXValue(0, 1), EPSILON);
    assertEquals(1.0, dataset.getYValue(0, 1), EPSILON);
}
Example #3
Source File: DatasetUtilitiesTest.java    From ccu-historian with GNU General Public License v3.0 5 votes vote down vote up 
/**
 * Some checks for the sampleFunction2D() method.
 */
@Test
public void testSampleFunction2D() {
    Function2D f = new LineFunction2D(0, 1);
    XYDataset dataset = DatasetUtilities.sampleFunction2D(f, 0.0, 1.0, 2,
            "S1");
    assertEquals(1, dataset.getSeriesCount());
    assertEquals("S1", dataset.getSeriesKey(0));
    assertEquals(2, dataset.getItemCount(0));
    assertEquals(0.0, dataset.getXValue(0, 0), EPSILON);
    assertEquals(0.0, dataset.getYValue(0, 0), EPSILON);
    assertEquals(1.0, dataset.getXValue(0, 1), EPSILON);
    assertEquals(1.0, dataset.getYValue(0, 1), EPSILON);
}
Example #4
Source File: DatasetUtilitiesTest.java    From SIMVA-SoS with Apache License 2.0 5 votes vote down vote up 
/**
 * Some checks for the sampleFunction2D() method.
 */
@Test
public void testSampleFunction2D() {
    Function2D f = new LineFunction2D(0, 1);
    XYDataset dataset = DatasetUtilities.sampleFunction2D(f, 0.0, 1.0, 2,
            "S1");
    assertEquals(1, dataset.getSeriesCount());
    assertEquals("S1", dataset.getSeriesKey(0));
    assertEquals(2, dataset.getItemCount(0));
    assertEquals(0.0, dataset.getXValue(0, 0), EPSILON);
    assertEquals(0.0, dataset.getYValue(0, 0), EPSILON);
    assertEquals(1.0, dataset.getXValue(0, 1), EPSILON);
    assertEquals(1.0, dataset.getYValue(0, 1), EPSILON);
}
Example #5
Source File: DatasetUtilitiesTest.java    From ECG-Viewer with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Some checks for the sampleFunction2D() method.
 */
@Test
public void testSampleFunction2D() {
    Function2D f = new LineFunction2D(0, 1);
    XYDataset dataset = DatasetUtilities.sampleFunction2D(f, 0.0, 1.0, 2,
            "S1");
    assertEquals(1, dataset.getSeriesCount());
    assertEquals("S1", dataset.getSeriesKey(0));
    assertEquals(2, dataset.getItemCount(0));
    assertEquals(0.0, dataset.getXValue(0, 0), EPSILON);
    assertEquals(0.0, dataset.getYValue(0, 0), EPSILON);
    assertEquals(1.0, dataset.getXValue(0, 1), EPSILON);
    assertEquals(1.0, dataset.getYValue(0, 1), EPSILON);
}
Example #6
Source File: DatasetUtilitiesTests.java    From astor with GNU General Public License v2.0 5 votes vote down vote up 
/**
 * Some checks for the sampleFunction2D() method.
 */
public void testSampleFunction2D() {
    Function2D f = new LineFunction2D(0, 1);
    XYDataset dataset = DatasetUtilities.sampleFunction2D(f, 0.0, 1.0, 2,
            "S1");
    assertEquals(1, dataset.getSeriesCount());
    assertEquals("S1", dataset.getSeriesKey(0));
    assertEquals(2, dataset.getItemCount(0));
    assertEquals(0.0, dataset.getXValue(0, 0), EPSILON);
    assertEquals(0.0, dataset.getYValue(0, 0), EPSILON);
    assertEquals(1.0, dataset.getXValue(0, 1), EPSILON);
    assertEquals(1.0, dataset.getYValue(0, 1), EPSILON);
}
Example #7
Source File: DatasetUtilitiesTest.java    From buffer_bci with GNU General Public License v3.0 5 votes vote down vote up 
/**
 * Some checks for the sampleFunction2D() method.
 */
@Test
public void testSampleFunction2D() {
    Function2D f = new LineFunction2D(0, 1);
    XYDataset dataset = DatasetUtilities.sampleFunction2D(f, 0.0, 1.0, 2,
            "S1");
    assertEquals(1, dataset.getSeriesCount());
    assertEquals("S1", dataset.getSeriesKey(0));
    assertEquals(2, dataset.getItemCount(0));
    assertEquals(0.0, dataset.getXValue(0, 0), EPSILON);
    assertEquals(0.0, dataset.getYValue(0, 0), EPSILON);
    assertEquals(1.0, dataset.getXValue(0, 1), EPSILON);
    assertEquals(1.0, dataset.getYValue(0, 1), EPSILON);
}
Example #8
Source File: LineFunction2DTests.java    From astor with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Some tests for the constructor.
 */
public void testConstructor() {
    LineFunction2D f = new LineFunction2D(1.0, 2.0);
    assertEquals(1.0, f.getIntercept(), EPSILON);
    assertEquals(2.0, f.getSlope(), EPSILON);
}
Example #9
Source File: LineFunction2DTests.java    From astor with GNU General Public License v2.0 4 votes vote down vote up 
/**
 * Objects that are equal should have the same hash code otherwise FindBugs
 * will tell on us...
 */
public void testHashCode() {
    LineFunction2D f1 = new LineFunction2D(1.0, 2.0);
    LineFunction2D f2 = new LineFunction2D(1.0, 2.0);
    assertEquals(f1.hashCode(), f2.hashCode());
}