/**
* Computes and plots correlation functions
*
* @param tauMax is the maximum time for correlation functions
*/
public void computeCorrelation(int tauMax) {
plotFrame.clearData();
double energyAccumulator = 0, magnetizationAccumulator = 0;
double energySquaredAccumulator = 0, magnetizationSquaredAccumulator = 0;
for (int t = 0; t < numberOfPoints; t++) {
energyAccumulator += energy[t];
magnetizationAccumulator += magnetization[t];
energySquaredAccumulator += energy[t] * energy[t];
magnetizationSquaredAccumulator += magnetization[t] * magnetization[t];
}
double averageEnergySquared = Math.pow(energyAccumulator / numberOfPoints, 2);
double averageMagnetizationSquared = Math.pow(magnetizationAccumulator / numberOfPoints, 2);
// compute normalization factors
double normE = (energySquaredAccumulator / numberOfPoints) - averageEnergySquared;
double normM = (magnetizationSquaredAccumulator / numberOfPoints) - averageMagnetizationSquared;
for (int tau = 1; tau <= tauMax; tau++) {
double c_MAccumulator = 0;
double c_EAccumulator = 0;
int counter = 0;
for (int t = 0; t < numberOfPoints - tau; t++) {
c_MAccumulator += magnetization[t] * magnetization[t + tau];
c_EAccumulator += energy[t] * energy[t + tau];
counter++;
}
// correlation function defined so that c(0) = 1 and c(infinity) -> 0
plotFrame.append(0, tau, ((c_MAccumulator / counter) - averageMagnetizationSquared) / normM);
plotFrame.append(1, tau, ((c_EAccumulator / counter) - averageEnergySquared) / normE);
}
plotFrame.setVisible(true);
}
public void readXMLData() {
energy = new double[0];
magnetization = new double[0];
numberOfPoints = 0;
String filename = "ising_data.xml";
JFileChooser chooser = OSPFrame.getChooser();
int result = chooser.showOpenDialog(null);
if (result == JFileChooser.APPROVE_OPTION) {
filename = chooser.getSelectedFile().getAbsolutePath();
} else {
return;
}
XMLControlElement xmlControl = new XMLControlElement(filename);
if (xmlControl.failedToRead()) {
control.println("failed to read: " + filename);
} else {
// gets the datasets in the xml file
Iterator it = xmlControl.getObjects(Dataset.class, false).iterator();
while (it.hasNext()) {
Dataset dataset = (Dataset) it.next();
if (dataset.getName().equals("magnetization")) {
magnetization = dataset.getYPoints();
}
if (dataset.getName().equals("energy")) {
energy = dataset.getYPoints();
}
}
numberOfPoints = magnetization.length;
control.println("Reading: " + filename);
control.println("Number of points = " + numberOfPoints);
}
calculate();
plotFrame.repaint();
}
private static void test2() {
int n1 = 11;
int n2 = 11;
float d1 = 1.0f / (float) max(1, n1 - 1);
float d2 = 1.0f / (float) max(1, n2 - 1);
float[][] f0 = rampfloat(0.0f, d1, d2, n1, n2);
float[][] f1 = zerofloat(n1, n2);
float[][] f2 = zerofloat(n1, n2);
// float[][] f1 = rampfloat(0.0f,d1,d2,n1,n2);
// float[][] f2 = rampfloat(0.0f,d1,d2,n1,n2);
Sampling s1 = new Sampling(n1, 0.5, 0.25 * (n1 - 1));
Sampling s2 = new Sampling(n2, 0.5, 0.25 * (n2 - 1));
PlotPanel panel = new PlotPanel(1, 2);
PixelsView pv0 = panel.addPixels(0, 0, new float[][][] {f0, f1, f2});
pv0.setInterpolation(PixelsView.Interpolation.NEAREST);
pv0.setClips(0, 0.0f, 2.0f);
pv0.setClips(1, 0.0f, 2.0f);
pv0.setClips(2, 0.0f, 2.0f);
pv0.set(new float[][][] {f0, f1, f2}); // should have no effect!
PixelsView pv0b = panel.addPixels(0, 0, s1, s2, new float[][][] {f1, f0, f2});
pv0b.setInterpolation(PixelsView.Interpolation.LINEAR);
pv0b.setClips(0, 0.0f, 2.0f);
pv0b.setClips(1, 0.0f, 2.0f);
pv0b.setClips(2, 0.0f, 2.0f);
PixelsView pv1 = panel.addPixels(0, 1, new float[][][] {f1, f2, f0});
pv1.setInterpolation(PixelsView.Interpolation.LINEAR);
pv1.setClips(0, 0.0f, 2.0f);
pv1.setClips(1, 0.0f, 2.0f);
pv1.setClips(2, 0.0f, 2.0f);
PixelsView pv1b = panel.addPixels(0, 1, s1, s2, new float[][][] {f1, f0, f2});
pv1b.setInterpolation(PixelsView.Interpolation.NEAREST);
pv1b.setClips(0, 0.0f, 2.0f);
pv1b.setClips(1, 0.0f, 2.0f);
pv1b.setClips(2, 0.0f, 2.0f);
PlotFrame frame = new PlotFrame(panel);
frame.setDefaultCloseOperation(PlotFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
// frame.paintToPng(300,6,"junk.png");
}
private static void go() {
int n1 = 101;
int n2 = 101;
// float[][] f = sin(rampfloat(0.0f,0.1f,0.1f,n1,n2));
float[][] f = zerofloat(n1, n2);
PlotPanel.Orientation orientation = PlotPanel.Orientation.X1DOWN_X2RIGHT;
PlotPanel panel = new PlotPanel(orientation);
PixelsView pv = panel.addPixels(f);
pv.setInterpolation(PixelsView.Interpolation.NEAREST);
pv.setColorModel(ColorMap.JET);
panel.addColorBar("time");
panel.setVLabel("depth (km)");
panel.setHLabel("distance (km)");
PlotFrame frame = new PlotFrame(panel);
frame.setDefaultCloseOperation(PlotFrame.EXIT_ON_CLOSE);
frame.setSize(800, 700);
frame.setFontSize(24);
frame.setVisible(true);
ModeManager mm = frame.getModeManager();
ImageEditMode iem = new ImageEditMode(mm, pv, 0.0f, f);
iem.setActive(true);
}
private static void test1() {
int n1 = 11;
int n2 = 11;
float d1 = 1.0f / (float) max(1, n1 - 1);
float d2 = 1.0f / (float) max(1, n2 - 1);
float[][] f = rampfloat(0.0f, d1, d2, n1, n2);
Sampling s1 = new Sampling(n1, 0.5, 0.25 * (n1 - 1));
Sampling s2 = new Sampling(n2, 0.5, 0.25 * (n2 - 1));
PlotPanel panel = new PlotPanel(1, 2);
PixelsView pv0 = panel.addPixels(0, 0, f);
pv0.setInterpolation(PixelsView.Interpolation.NEAREST);
pv0.setColorModel(ColorMap.JET);
pv0.setPercentiles(0.0f, 100.0f);
f = mul(10.0f, f);
pv0.set(f);
PixelsView pv0b = panel.addPixels(0, 0, s1, s2, f);
pv0b.setInterpolation(PixelsView.Interpolation.LINEAR);
pv0b.setColorModel(ColorMap.GRAY);
pv0b.setPercentiles(0.0f, 100.0f);
PixelsView pv1 = panel.addPixels(0, 1, f);
pv1.setInterpolation(PixelsView.Interpolation.LINEAR);
pv1.setColorModel(ColorMap.GRAY);
pv1.setPercentiles(0.0f, 100.0f);
f = mul(10.0f, f);
pv1.set(f);
PixelsView pv1b = panel.addPixels(0, 1, s1, s2, f);
pv1b.setInterpolation(PixelsView.Interpolation.NEAREST);
pv1b.setColorModel(ColorMap.JET);
pv1b.setPercentiles(0.0f, 100.0f);
PlotFrame frame = new PlotFrame(panel);
frame.setDefaultCloseOperation(PlotFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
// frame.paintToPng(300,6,"junk.png");
}