List of usage examples for java.lang StrictMath pow
public static double pow(double a, double b)
From source file:Main.java
public static void main(String[] args) { double d1 = 1.2, d2 = 3.4, d3 = 1; System.out.println("" + d1 + " to the power of " + d2 + " = " + StrictMath.pow(d1, d2)); System.out.println("" + d1 + " to the power of " + d3 + " = " + StrictMath.pow(d1, d3)); }
From source file:cc.redberry.core.number.Numeric.java
@Override public Numeric pow(double exponent) { return createNumeric(StrictMath.pow(value, exponent)); }
From source file:weka.gui.beans.JFreeChartOffscreenChartRenderer.java
/** * Render histogram(s) (numeric attribute) or bar chart (nominal attribute). * Some implementations may not be able to render more than one histogram/bar * on the same chart - the implementation can either throw an exception or * just process the first series in this case. * //from w w w.j a v a2 s. com * @param width the width of the resulting chart in pixels * @param height the height of the resulting chart in pixels * @param series a list of Instances - one for each series to be plotted * @param attsToPlot the attribute to plot corresponding to the Instances in * the series list * @param optionalArgs optional arguments to the renderer (may be null) * * @return a BufferedImage containing the chart * @throws Exception if there is a problem rendering the chart */ public BufferedImage renderHistogram(int width, int height, List<Instances> series, String attToPlot, List<String> additionalArgs) throws Exception { String plotTitle = "Bar Chart"; String userTitle = getOption(additionalArgs, "-title"); plotTitle = (userTitle != null) ? userTitle : plotTitle; String colorAtt = getOption(additionalArgs, "-color"); String pareto = getOption(additionalArgs, "-pareto"); boolean doPareto = false; if (pareto != null && pareto.length() == 0 && series.size() == 1) { doPareto = true; } if (series.size() == 1 && colorAtt != null && colorAtt.length() > 0) { int colIndex = getIndexOfAttribute(series.get(0), colorAtt); if (colIndex >= 0 && series.get(0).attribute(colIndex).isNominal() && !doPareto) { // split single series out into multiple instances objects - one // per class series = splitToClasses(series.get(0), colIndex); for (Instances insts : series) { insts.setClassIndex(colIndex); } } } Instances masterInstances = series.get(0); int attIndex = getIndexOfAttribute(masterInstances, attToPlot); if (attIndex < 0) { attIndex = 0; } if (!(series.get(0).attribute(attIndex).isNominal() || series.get(0).attribute(attIndex).isRelationValued())) { doPareto = false; } // Do a pareto chart if (doPareto) { final DefaultKeyedValues data = new DefaultKeyedValues(); AttributeStats attStats = masterInstances.attributeStats(attIndex); double[] attValFreqs = attStats.nominalWeights; for (int i = 0; i < attValFreqs.length; i++) { Number freq = new Double(attValFreqs[i]); data.addValue(masterInstances.attribute(attIndex).value(i), freq); } data.sortByValues(SortOrder.DESCENDING); final KeyedValues cumulative = DataUtilities.getCumulativePercentages(data); final CategoryDataset dataset = DatasetUtilities .createCategoryDataset(masterInstances.attribute(attIndex).name(), data); final JFreeChart chart = ChartFactory.createBarChart(plotTitle, masterInstances.attribute(attIndex).name(), "Fequency/weight mass", dataset, PlotOrientation.VERTICAL, true, false, false); final CategoryPlot plot = chart.getCategoryPlot(); final CategoryAxis domainAxis = plot.getDomainAxis(); domainAxis.setLowerMargin(0.02); domainAxis.setUpperMargin(0.02); LineAndShapeRenderer renderer2 = new LineAndShapeRenderer(); CategoryDataset dataset2 = DatasetUtilities.createCategoryDataset("Cumulative", cumulative); final NumberAxis axis2 = new NumberAxis("Percent"); axis2.setNumberFormatOverride(NumberFormat.getPercentInstance()); // plot. plot.setRangeAxis(1, axis2); plot.setDataset(1, dataset2); plot.setRenderer(1, renderer2); plot.mapDatasetToRangeAxis(1, 1); plot.setDatasetRenderingOrder(DatasetRenderingOrder.FORWARD); chart.setBackgroundPaint(java.awt.Color.white); BufferedImage image = chart.createBufferedImage(width, height); return image; } boolean seriesAreClasses = false; int classIndex = masterInstances.classIndex(); if (classIndex >= 0 && !masterInstances.attribute(classIndex).isNumeric() && !masterInstances.attribute(classIndex).isRelationValued() && masterInstances.attributeStats(classIndex).distinctCount == 1) { // series correspond to class labels (assume that subsequent series only // contain instances of one class)... seriesAreClasses = true; } // bar chart for a nominal attribute if (masterInstances.attribute(attIndex).isNominal() || masterInstances.attribute(attIndex).isString()) { DefaultCategoryDataset dataset = new DefaultCategoryDataset(); // do the master series String masterSeriesTitle = masterInstances.relationName(); if (seriesAreClasses) { for (int i = 0; i < masterInstances.numInstances(); i++) { Instance current = masterInstances.instance(i); if (!current.isMissing(classIndex)) { masterSeriesTitle = current.stringValue(classIndex); break; } } } AttributeStats attStats = masterInstances.attributeStats(attIndex); double[] attValFreqs = attStats.nominalWeights; for (int i = 0; i < attValFreqs.length; i++) { Number freq = new Double(attValFreqs[i]); dataset.addValue(freq, masterSeriesTitle, masterInstances.attribute(attIndex).value(i)); } // any subsequent series for (int i = 1; i < series.size(); i++) { Instances nextSeries = series.get(i); String seriesTitle = nextSeries.relationName(); if (seriesAreClasses) { for (int j = 0; j < nextSeries.numInstances(); j++) { Instance current = nextSeries.instance(j); if (!current.isMissing(classIndex)) { seriesTitle = current.stringValue(classIndex); break; } } attStats = nextSeries.attributeStats(attIndex); attValFreqs = attStats.nominalWeights; for (int j = 0; j < attValFreqs.length; j++) { Number freq = new Double(attValFreqs[j]); dataset.addValue(freq, seriesTitle, nextSeries.attribute(attIndex).value(j)); } } } JFreeChart chart = null; if (series.size() == 1) { chart = ChartFactory.createBarChart(plotTitle, masterInstances.attribute(attIndex).name(), "Fequency/weight mass", dataset, PlotOrientation.VERTICAL, true, false, false); } else { chart = ChartFactory.createStackedBarChart(plotTitle, masterInstances.attribute(attIndex).name(), "Fequency/weight mass", dataset, PlotOrientation.VERTICAL, true, false, false); } chart.setBackgroundPaint(java.awt.Color.white); BufferedImage image = chart.createBufferedImage(width, height); return image; } else { // histogram for numeric attributes HistogramDataset dataset = new HistogramDataset(); // combine all series in order to get overall std dev, and range Instances temp = new Instances(masterInstances); for (int i = 1; i < series.size(); i++) { Instances additional = series.get(i); for (Instance tempI : additional) { temp.add(tempI); } } AttributeStats stats = temp.attributeStats(attIndex); Stats numericStats = stats.numericStats; double intervalWidth = 3.49 * numericStats.stdDev * StrictMath.pow(temp.numInstances(), (-1.0 / 3.0)); double range = numericStats.max - numericStats.min; int numBins = StrictMath.max(1, (int) StrictMath.round(range / intervalWidth)); // do the master series String masterSeriesTitle = masterInstances.relationName(); if (seriesAreClasses) { for (int i = 0; i < masterInstances.numInstances(); i++) { Instance current = masterInstances.instance(i); if (!current.isMissing(current.classAttribute())) { masterSeriesTitle = current.stringValue(current.classAttribute()); break; } } } // have to set min, max and num bins (using heuristic from AttSummPanel). // Make sure // to set series length to num instances - num missing values for att stats = masterInstances.attributeStats(attIndex); /* * numericStats = stats.numericStats; //numericStats.calculateDerived(); * intervalWidth = StrictMath.max(1, 3.49 * numericStats.stdDev * * StrictMath.pow(masterInstances.numInstances(), (-1.0/3.0))); */ double[] seriesVals = new double[masterInstances.numInstances() - stats.missingCount]; int count = 0; for (int i = 0; i < masterInstances.numInstances(); i++) { Instance current = masterInstances.instance(i); if (!current.isMissing(attIndex)) { seriesVals[count++] = current.value(attIndex); } } dataset.addSeries(masterSeriesTitle, seriesVals, numBins, numericStats.min, numericStats.max); // any subsequent series for (int i = 1; i < series.size(); i++) { Instances nextSeries = series.get(i); String seriesTitle = nextSeries.relationName(); if (seriesAreClasses) { for (int j = 0; j < nextSeries.numInstances(); j++) { Instance current = nextSeries.instance(j); if (!current.isMissing(nextSeries.classAttribute())) { seriesTitle = current.stringValue(nextSeries.classAttribute()); break; } } } stats = nextSeries.attributeStats(attIndex); /* * numericStats = stats.numericStats; // * numericStats.calculateDerived(); intervalWidth = StrictMath.max(1, * 3.49 * numericStats.stdDev * * StrictMath.pow(masterInstances.numInstances(), (-1.0/3.0))); range = * numericStats.max - numericStats.min; numBins = StrictMath.max(1, * (int) StrictMath.round(range / intervalWidth)); */ seriesVals = new double[nextSeries.numInstances() - stats.missingCount]; count = 0; for (int j = 0; j < nextSeries.numInstances(); j++) { Instance current = nextSeries.instance(j); if (!current.isMissing(attIndex)) { seriesVals[count++] = current.value(attIndex); } } dataset.addSeries(seriesTitle, seriesVals, numBins, numericStats.min, numericStats.max); } JFreeChart chart = ChartFactory.createHistogram(plotTitle, masterInstances.attribute(attIndex).name(), null, dataset, PlotOrientation.VERTICAL, true, false, false); // chart.setBackgroundPaint(java.awt.Color.white); XYPlot xyplot = (XYPlot) chart.getPlot(); xyplot.setForegroundAlpha(0.50F); XYBarRenderer xybarrenderer = (XYBarRenderer) xyplot.getRenderer(); xybarrenderer.setDrawBarOutline(false); xybarrenderer.setShadowVisible(false); BufferedImage image = chart.createBufferedImage(width, height); return image; } }
From source file:org.esa.beam.util.math.FastMathPerformance.java
public void testPow() { System.gc();//from ww w.j a va2 s.co m double x = 0; long time = System.nanoTime(); for (int i = 0; i < RUNS; i++) x += StrictMath.pow(Math.PI + i * F1, i * F1); long strictTime = System.nanoTime() - time; System.gc(); double y = 0; time = System.nanoTime(); for (int i = 0; i < RUNS; i++) y += FastMath.pow(Math.PI + i * F1, i * F1); long fastTime = System.nanoTime() - time; System.gc(); double z = 0; time = System.nanoTime(); for (int i = 0; i < RUNS; i++) z += Math.pow(Math.PI + i * F1, i * F1); long mathTime = System.nanoTime() - time; report("pow", x + y + z, strictTime, fastTime, mathTime); }
From source file:org.esa.beam.util.math.FastMathPerformance.java
public void testPowFromIntToInt() { System.gc();/*from w w w.java 2s . com*/ double x = 0; long time = System.nanoTime(); for (int i = 0; i < RUNS; i++) x += StrictMath.pow(i, i); long strictTime = System.nanoTime() - time; System.gc(); double y = 0; time = System.nanoTime(); for (int i = 0; i < RUNS; i++) y += FastMath.pow(i, i); long fastTime = System.nanoTime() - time; System.gc(); double z = 0; time = System.nanoTime(); for (int i = 0; i < RUNS; i++) z += Math.pow(i, i); long mathTime = System.nanoTime() - time; report("powII", x + y + z, strictTime, fastTime, mathTime); }
From source file:org.globus.workspace.network.defaults.MacUtil.java
private static String _pickNewWithRandomComponent(List macs, String macPrefix, long needed) throws ResourceRequestDeniedException { final long limit = (long) StrictMath.pow(16, needed); long count = 0; while (true) { if (count >= limit) { // Even at lowest allowable limit (~65000), this is very // unlikely to ever occur. throw new ResourceRequestDeniedException("Search limit reached (" + count + ") looking for MAC to assign. Please inform developers."); }/* ww w . ja va 2 s .c om*/ String attempt = appendRandomCharacter(macPrefix); while (attempt.length() < 17) { attempt = appendRandomCharacter(attempt); } if (uniqueMacTest(macs, attempt)) { return attempt; } else { count += 1; } } }