Java IDataset.set方法代码示例

import org.eclipse.january.dataset.IDataset; //导入方法依赖的package包/类
/**
 * Fill a Julia set around the origin for the value C = a + bi
 */
private IDataset calculateJuliaSet(final double a, final double b, int columns, int rows) {
	final double xStart = -model.getMaxRealCoordinate();
	final double xStop = model.getMaxRealCoordinate();
	final double yStart = -model.getMaxImaginaryCoordinate();
	final double yStop = model.getMaxImaginaryCoordinate();
	final double yStep = (yStop - yStart) / (rows - 1);
	double y;
	IDataset juliaSet = DatasetFactory.zeros(rows,columns);
	for (int yIndex = 0; yIndex < rows; yIndex++) {
		y = yStart + yIndex * yStep;
		IDataset line = calculateJuliaSetLine(a, b, y, xStart, xStop, columns);
		for (int x = 0; x < line.getSize(); x++) {
			juliaSet.set(line.getObject(x), yIndex, x);
		}
	}
	return juliaSet;
}
 

import org.eclipse.january.dataset.IDataset; //导入方法依赖的package包/类
/**
 * Fill a Julia set around the origin for the value C = a + bi
 */
private IDataset calculateJuliaSet(final double a, final double b, int columns, int rows) {
	final double xStart = -model.getMaxx();
	final double xStop = model.getMaxx();
	final double yStart = -model.getMaxy();
	final double yStop = model.getMaxy();
	final double yStep = (yStop - yStart) / (rows - 1);
	double y;
	IDataset juliaSet = DatasetFactory.zeros(DoubleDataset.class, 1, 1, rows, columns);
	for (int yIndex = 0; yIndex < rows; yIndex++) {
		y = yStart + yIndex * yStep;
		IDataset line = calculateJuliaSetLine(a, b, y, xStart, xStop, columns);
		for (int x = 0; x < line.getSize(); x++) {
			juliaSet.set(line.getObject(x), 0, 0, yIndex, x);
		}
	}
	return juliaSet;
}
 

import org.eclipse.january.dataset.IDataset; //导入方法依赖的package包/类
/**element-by-element AND operator
 * a & b                   logical_and(a,b)
 */
@Test
public void logicalAnd() {
	
	// Equivalent tech
	BooleanDataset bs = Comparisons.logicalAnd(a, b);
  	System.out.println("Result of a && b "+bs);
  	
	// Or more useful (?)
	final IDataset booleans = DatasetFactory.zeros(BooleanDataset.class, 3, 3);
   	booleans.set(true, 0,0);
   	booleans.set(true, 1,1);
   	booleans.set(true, 1,2);
  	
  	final IDataset and = Maths.multiply(a, booleans);
  	System.out.println("Keeping some values using a boolean mask "+and);
}
 

import org.eclipse.january.dataset.IDataset; //导入方法依赖的package包/类
/**
 * Fill a Julia set line between xStart and xStop at the given y value, for the value C = a + bi
 */
private IDataset calculateJuliaSetLine(final double a, final double b, final double y, final double xStart, final double xStop, final int numPoints) {
	final double xStep = (xStop - xStart) / (numPoints - 1);
	double x;
	IDataset juliaSetLine = DatasetFactory.zeros(numPoints);
	for (int xIndex = 0; xIndex < numPoints; xIndex++) {
		x = xStart + xIndex * xStep;
		juliaSetLine.set(julia(x, y, a, b), xIndex);
	}
	return juliaSetLine;
}
 

import org.eclipse.january.dataset.IDataset; //导入方法依赖的package包/类
/**
 * Fill a Julia set line between xStart and xStop at the given y value, for the value C = a + bi
 */
private IDataset calculateJuliaSetLine(final double a, final double b, final double y, final double xStart, final double xStop, final int numPoints) {
	final double xStep = (xStop - xStart) / (numPoints - 1);
	double x;
	IDataset juliaSetLine = DatasetFactory.zeros(DoubleDataset.class, numPoints);
	for (int xIndex = 0; xIndex < numPoints; xIndex++) {
		x = xStart + xIndex * xStep;
		juliaSetLine.set(julia(x, y, a, b), xIndex);
	}
	return juliaSetLine;
}
 

import org.eclipse.january.dataset.IDataset; //导入方法依赖的package包/类
@Override
protected void createExampleContent(Composite parent) {
	
	// We create a basic plot
	system.createPlotPart(parent, "Vector Example", getViewSite().getActionBars(), PlotType.IMAGE, this);
	
	Dataset vectors = DatasetFactory.zeros(new int[]{20, 20, 2}, Dataset.FLOAT32);
	
	for (int x = 0; x < 20; x++) {
		for (int y = 0; y < 20; y++) {
			vectors.set(x*100, x, y, 0); // This gets normalized later
			vectors.set(2*Math.PI*((double)x/(20d)), x, y, 1);
		}
	}
	
	final IDataset xAxis = DatasetFactory.zeros(new int[]{20}, Dataset.FLOAT32);
	final IDataset yAxis = DatasetFactory.zeros(new int[]{20}, Dataset.FLOAT32);
	for (int i = 0; i < 20; i++) {
		xAxis.set(i*5, i);
		yAxis.set(i*5, i);
	}
	
	final IVectorTrace vector = system.createVectorTrace("vector1");
	vector.setData(vectors, Arrays.asList(xAxis, yAxis));
	vector.setArrowColor(200, 0, 0);
	vector.setArrowConfiguration(ArrowConfiguration.TO_CENTER_WITH_CIRCLE);
	vector.setCircleColor(0,200,0);
	//vector.setVectorNormalizationType(VectorNormalizationType.LOGARITHMIC);
	system.addTrace(vector);
}