public void UpdateScaleByCalcaulateType(ShipModelCalculateType calculateType = ShipModelCalculateType.Length, double length = 0, double width = 0, double height = 0) { if (Ship3DModelInfo == null || (length == 0 && width == 0 && height == 0) || calculateType == ShipModelCalculateType.None) { return; } float scale_x = 1; float scale_y = 1; float scale_z = 1; if (length > 0 && Ship3DModelInfo.Ship3DModelLength > 0) { scale_z = (float)(length / Ship3DModelInfo.Ship3DModelLength); } if (width > 0 && Ship3DModelInfo.Ship3DModelWidth > 0) { scale_x = (float)(width / Ship3DModelInfo.Ship3DModelWidth); } if (height > 0 && Ship3DModelInfo.Ship3DModelHeight > 0) { scale_y = (float)(height / Ship3DModelInfo.Ship3DModelHeight); } if (calculateType == ShipModelCalculateType.Length) { transform.localScale = new Vector3(scale_z, scale_z, scale_z); } else if (calculateType == ShipModelCalculateType.ALL) { transform.localScale = new Vector3(scale_x, scale_y, scale_z); } }与public void UpdateScaleByCalcaulateType(ShipModelCalculateType calculateType = ShipModelCalculateType.Length, double length = 0, double width = 0, double height = 0) { if (Ship3DModelInfo == null || (length == 0 && width == 0 && height == 0) || calculateType == ShipModelCalculateType.None) { return; } bool isUpdate = false; float scale_x = 1; float scale_y = 1; float scale_z = 1; switch (calculateType) { case ShipModelCalculateType.Length: { if (length > 0 && Ship3DModelInfo.Ship3DModelLength > 0) { isUpdate = true; scale_z = (float)(length / Ship3DModelInfo.Ship3DModelLength); } } break; case ShipModelCalculateType.Width: { if (width > 0 && Ship3DModelInfo.Ship3DModelWidth > 0) { isUpdate = true; scale_x = (float)(width / Ship3DModelInfo.Ship3DModelWidth); } } break; case ShipModelCalculateType.Height: { if (height > 0 && Ship3DModelInfo.Ship3DModelHeight > 0) { isUpdate = true; scale_y = (float)(height / Ship3DModelInfo.Ship3DModelHeight); } } break; case ShipModelCalculateType.ALL: case ShipModelCalculateType.None: default: break; } if (isUpdate) { transform.localScale = new Vector3(scale_x, scale_y, scale_z); } }有什么不一样的地方

浅谈Java double 相乘的结果偏差小问题

public static void main(String[] args) { double d = 538.8; BigDecimal a1 = new BigDecimal(Double.toString(d)); BigDecimal b1 = new BigDecimal(Double.toString(100)); BigDecimal result = a1....

java中double类型运算结果异常的解决方法

if (scale < 0) { throw new IllegalArgumentException("错误的精度"); } BigDecimal a2 = new BigDecimal(Double.toString(a1)); BigDecimal b2 = new BigDecimal(Double.toString(b1)); return a2.divide(b2...

package b; public class yx { public static void main(String[] args) { Cuboid v = new Cuboid(); v.volume(); } } class Rectangle{ double length; double width; } class Cuboid extends Rectangle{ double height; public Cuboid(double length,double width,double height) { this.length=length; this.width=width; this.height=height; } void volume() { length=10; width=5; height=2; System.out.println("体积为：" +lengthwidthheight); } }

public Cuboid(double length, double width, double height) { this.length = length; this.width = width; this.height = height; } void volume() { System.out.println("体积为：" + length * width * ...

定义一个构造方法Cuboid(double length double width double height)

好的，以下是一个定义了三个参数的构造方法 Cuboid(double length, double width, double height) 的示例代码： java public class Cuboid { private double length; private double width; private double...

class Retangle { public Retangle(double 1, double w) { length=1; width=w;} public double calcPerimet

public Retangle(double length, double width) { this.length = length; this.width = width; } // 计算周长的方法 public double calcPerimeter() { return 2 * (length + width); } }

DDJNew(Double[] TIE, Int64 cycleLength）{Int32 cycle = TIE.Length / cycleLength;}完善代码

public static (List<Double>[] Periods, Int32 RemainingElements) DDJNew(Double[] TIE, Int64 cycleLength) { int cycle = TIE.Length / cycleLength; List<Double>[] periods = new List<Double>[cycle]; ...

在ts中if (res == [null, null]) { res.length = 0 }怎么改错

public double 0; } 这里使用了数组的 every 方法来判断数组中的每一个元素是否都等于 getScore() { return score; } public String getMajor() { return major; } @Override null，如果都等于 ...

public class Example4_5 { public static void main(String args[]) { Rect ractangle = new Rect(); double width = 109.87; double height = 25.18; double area=ractangle.getArea(); System.out.println("矩形的面积:"+area); Lader lader=new Lader(); lader.above=10.798; lader.bottom=156.65; lader.height=18.12; area=lader.getArea(); System.out.println("梯形的面积:"+area); } }那为什么这样算出来矩形的面积为0

你的程序中没有设置矩形的长和宽，因此默认值为0，所以计算出来的矩形面积也为0。你需要在使用 Rect 类的 getArea 方法之前，先设置矩形的长和宽，例如： java double width = 109.87; double height = 25.18; ...

public abstract class Shape { public abstract double getArea();}public interface Drawable { void draw();}public class Rectangle extends Shape implements Drawable { private double width; private double height; public Rectangle(double width, double height) { this.width = width; this.height = height; } @Override public double getArea() { return width * height; } @Override public void draw() { System.out.println("Drawing a rectangle."); }}

这段代码展示了一个抽象类 Shape 和一个接口 Drawable，以及一个实现了 Shape 和 Drawable 的具体类 Rectangle。Shape 类是一个抽象类，其中定义了一个抽象方法 getArea()，这个方法没有实现，需要在子类中具体实现...

“@Override public double userSimilarity(long userID1, long userID2) throws Exception { PreferenceArray xPrefs = dataModel.getPreferencesFromUser(userID1); PreferenceArray yPrefs = dataModel.getPreferencesFromUser(userID2); int xLength = xPrefs.length(); int yLength = yPrefs.length(); if (xLength == 0 || yLength == 0) { return Double.NaN; } long xIndex = xPrefs.getItemID(0); long yIndex = yPrefs.getItemID(0); int xPrefIndex = 0; int yPrefIndex = 0; double sumX = 0.0; double sumX2 = 0.0; double sumY = 0.0; double sumY2 = 0.0; double sumXY = 0.0; double sumXYdiff2 = 0.0; int count = 0; while (true) { int compare = Long.compare(xIndex, yIndex); if (compare == 0) { double x = xPrefs.getValue(xPrefIndex); double y = yPrefs.getValue(yPrefIndex); sumXY += x * y; sumX += x; sumX2 += x * x; sumY += y; sumY2 += y * y; double diff = x - y; sumXYdiff2 += diff * diff; count++; } if (compare <= 0) { if (++xPrefIndex >= xLength) { if (yIndex == Long.MAX_VALUE) { break; } xIndex = Long.MAX_VALUE; } else { xIndex = xPrefs.getItemID(xPrefIndex); } } if (compare >= 0) { if (++yPrefIndex >= yLength) { if (xIndex == Long.MAX_VALUE) { break; } yIndex = Long.MAX_VALUE; } else { yIndex = yPrefs.getItemID(yPrefIndex); } } } double meanX = sumX / count; double meanY = sumY / count; double numerator = sumXY - sumX * sumY / count; double denominator = Math.sqrt((sumX2 - sumX * meanX) * (sumY2 - sumY * meanY)); if (denominator == 0.0) { return Double.NaN; } double result = numerator / denominator; if (!Double.isNaN(result)) { result = normalizeWeightResult(result, count, cachedNumItems); } return result; }” 解释代码

3. 获取xPrefs和yPrefs的长度，分别为xLength和yLength； 4. 通过getItemID方法获取xPrefs和yPrefs中第一个评分项的ID，分别为xIndex和yIndex； 5. 初始化xPrefIndex和yPrefIndex为0，表示当前正在处理的评分项在...

public void Setdata(int n0,double[] w,String str) //设置初始值

public void SetData(int n0, double[] w, String str) { this.initialValue = n0; System.arraycopy(w, 0, this.weights, 0, w.length); // 将数组复制到类的数组字段 this.initialValueStr = str; } } // ...

abstract class Shape { public abstract double area(); } class Circle extends Shape { private double radius; public Circle(double radius) { this.radius = radius; } @Override public double area() { return Math.PI * radius * radius; } } class Rectangle extends Shape { private double length; private double width; public Rectangle(double length, double width) { this.length = length; this.width = width; } @Override public double area() { return length * width; } } class Triangle extends Shape { private double base; private double height; public Triangle(double base, double height) { this.base = base; this.height = height; } @Override public double area() { return 0.5 * base * height; } } public class PolymorphismDemo { public static void main(String[] args) { Shape[] shapes = new Shape[3]; shapes[0] = new Circle(2.0); shapes[1] = new Rectangle(3.0, 4.0); shapes[2] = new Triangle(2.0, 3.0); double totalArea = 0.0; for (Shape shape : shapes) { totalArea += shape.area(); } System.out.println("Total area: " + totalArea); } }

这段代码展示了多态的概念。Shape是一个抽象类，定义了一个抽象方法area()，表示形状的面积。Circle、Rectangle和Triangle是Shape的子类，它们都实现了area()方法，并分别表示圆、矩形和三角形。...

package work; import java.applet.Applet; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.Line2D; import java.awt.geom.Point2D; public class CyrusBeckAlgorithmApplet extends Applet { private static final long serialVersionUID = 1L; private Point2D.Double[] clipWindow; private Point2D.Double[][] lines; private double[][] vectors; private double[] p1, p2, D; @Override public void init() { clipWindow = new Point2D.Double[3]; clipWindow[0] = new Point2D.Double(200, 275); clipWindow[1] = new Point2D.Double(250.0 / 3, 100); clipWindow[2] = new Point2D.Double(950.0 / 3, 100); lines = new Point2D.Double[2][2]; lines[0][0] = new Point2D.Double(0, 120); lines[0][1] = new Point2D.Double(400, 120); lines[1][0] = new Point2D.Double(0, 180); lines[1][1] = new Point2D.Double(400, 180); vectors = new double[2][2]; D = new double[2]; } @Override public void paint(Graphics g) { super.paint(g); Graphics2D g2d = (Graphics2D) g; // draw clip window g2d.setColor(Color.BLACK); g2d.draw(new Line2D.Double(clipWindow[0], clipWindow[1])); g2d.draw(new Line2D.Double(clipWindow[1], clipWindow[2])); g2d.draw(new Line2D.Double(clipWindow[2], clipWindow[0])); // draw lines for (int i = 0; i < lines.length; i++) { Point2D.Double p1 = lines[i][0]; Point2D.Double p2 = lines[i][1]; cyrusBeckClip(g2d, p1, p2); } } private void cyrusBeckClip(Graphics2D g2d, Point2D.Double p1, Point2D.Double p2) { double tE = 0, tL = 1; double dx = p2.x - p1.x; double dy = p2.y - p1.y; for (int i = 0; i < clipWindow.length; i++) { Point2D.Double P1 = clipWindow[i]; Point2D.Double P2 = clipWindow[(i + 1) % clipWindow.length]; double nx = -(P2.y - P1.y); double ny = P2.x - P1.x; double D = -nx * P1.x - ny * P1.y; double numerator = nx * p1.x + ny * p1.y + D; double denominator = -(nx * dx + ny * dy); if (denominator == 0) { if (numerator < 0) { return; } } else { double t = numerator / denominator; if (denominator < 0) { tE = Math.max(tE, t); } else { tL = Math.min(tL, t); } } } if (tE <= tL) { double x1 = p1.x + tE * dx; double y1 = p1.y + tE * dy; double x2 = p1.x + tL * dx; double y2 = p1.y + tL * dy; g2d.setColor(Color.BLUE); g2d.draw(new Line2D.Double(p1, new Point2D.Double(x1, y1))); g2d.setColor(Color.RED); g2d.draw(new Line2D.Double(new Point2D.Double(x1, y1), new Point2D.Double(x2, y2))); g2d.setColor(Color.BLUE); g2d.draw(new Line2D.Double(new Point2D.Double(x2, y2), p2)); } } } 将此代码改为 Java 应用程序运行

new Point2D.Double(250.0 / 3, 100), new Point2D.Double(950.0 / 3, 100) }; private static final Point2D.Double[][] lines = { { new Point2D.Double(0, 120), new Point2D.Double(400, 120) }, { new ...

“@Override public double itemSimilarity(long itemID1, long itemID2) throws Exception{ PreferenceArray xPrefs = dataModel.getPreferencesForItem(itemID1); PreferenceArray yPrefs = dataModel.getPreferencesForItem(itemID2); int xLength = xPrefs.length(); int yLength = yPrefs.length(); if (xLength == 0 || yLength == 0) { return Double.NaN; } long xIndex = xPrefs.getUserID(0); long yIndex = yPrefs.getUserID(0); int xPrefIndex = 0; int yPrefIndex = 0; double sumX = 0.0; double sumX2 = 0.0; double sumY = 0.0; double sumY2 = 0.0; double sumXY = 0.0; double sumXYdiff2 = 0.0; int count = 0; while (true) { int compare = Long.compare(xIndex, yIndex); if (compare == 0) { double x = xPrefs.getValue(xPrefIndex); double y = yPrefs.getValue(yPrefIndex); sumXY += x * y; sumX += x; sumX2 += x * x; sumY += y; sumY2 += y * y; double diff = x - y; sumXYdiff2 += diff * diff; count++; } if (compare <= 0) { if (++xPrefIndex == xLength) { break; } xIndex = xPrefs.getUserID(xPrefIndex); } if (compare >= 0) { if (++yPrefIndex == yLength) { break; } yIndex = yPrefs.getUserID(yPrefIndex); } } double meanX = sumX / count; double meanY = sumY / count; double numerator = sumXY - sumX * sumY / count; double denominator = Math.sqrt((sumX2 - sumX * meanX) * (sumY2 - sumY * meanY)); if (denominator == 0.0) { return Double.NaN; } double result = numerator / denominator; if (!Double.isNaN(result)) { result = normalizeWeightResult(result, count, cachedNumUsers); } return result; }” 解释代码

2. 判断两个PreferenceArray的长度是否为0，如果有一个为0则返回Double.NaN（表示无法计算相似度）。 3. 初始化一些变量用于计算相似度，包括sumX、sumX2、sumY、sumY2、sumXY、sumXYdiff2和count。 4. 通过while...

帮我优化这段C#代码 public double[] GetProfile(Beam beam) { double num = 0.0; double num1 = 0.0; double num2 = 0.0; double num3 = 0.0; double num4 = 0.0; string[] str = Regex.Replace(beam.Profile.ProfileString, "[a-z]", "", RegexOptions.IgnoreCase).Split('-', '*'); if (beam.Profile.ProfileString.StartsWith("HI") || beam.Profile.ProfileString.StartsWith("PHI") || beam.Profile.ProfileString.StartsWith("WI") || beam.Profile.ProfileString.StartsWith("CC") || beam.Profile.ProfileString.StartsWith("ZZ")) { switch (str.Length) { case 5: num = Convert.ToDouble(str[0]); num1 = Convert.ToDouble(str[2]); num2 = Convert.ToDouble(str[3]); num3 = Convert.ToDouble(str[4]); num4 = Convert.ToDouble(str[1]); break; case 4: num = Convert.ToDouble(str[0]); num1 = Convert.ToDouble(str[1]); num2 = Convert.ToDouble(str[2]); num3 = Convert.ToDouble(str[3]); num4 = Convert.ToDouble(str[0]); break; } } else { num = Convert.ToDouble(str[0]); num1 = Convert.ToDouble(str[2]); num2 = Convert.ToDouble(str[3]); num3 = Convert.ToDouble(str[1]); num4 = Convert.ToDouble(str[0]); } return new double[5] { num, num1, num2, num3, num4 }; }

public double[] GetProfile(Beam beam) { double num = 0.0, num1 = 0.0, num2 = 0.0, num3 = 0.0, num4 = 0.0; var str = Regex.Replace(beam.Profile.ProfileString, "[a-z]", "", RegexOptions.IgnoreCase)....

能补充这段代码吗import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.layout.Pane; import javafx.scene.paint.Color; import javafx.scene.shape.Circle; import javafx.scene.shape.Rectangle; import javafx.scene.shape.Polygon; import javafx.stage.Stage; import java.io.FileInputStream; import java.io.IOException; import java.util.Properties; abstract class Shape { protected Color color; protected double area; protected double perimeter; protected double positionX; protected double positionY; public abstract void calculateArea(); public abstract void calculatePerimeter(); public abstract void draw(Pane pane); public void setPosition(double x, double y) { this.positionX = x; this.positionY = y; } } class CircleShape extends Shape { private double radius; public CircleShape(double radius) { this.radius = radius; this.color = Color.RED; } @Override public void calculateArea() { this.area = Math.PI * Math.pow(radius, 2); } @Override public void calculatePerimeter() { this.perimeter = 2 * Math.PI * radius; } @Override public void draw(Pane pane) { Circle circle = new Circle(radius); circle.setFill(color); circle.setLayoutX(positionX); circle.setLayoutY(positionY); pane.getChildren().add(circle); } } class RectangleShape extends Shape { private double width; private double height; public RectangleShape(double width, double height) { this.width = width; this.height = height; this.color = Color.BLUE; } @Override public void calculateArea() { this.area = width * height; } @Override public void calculatePerimeter() { this.perimeter = 2 * (width + height); } @Override public void draw(Pane pane) { Rectangle rectangle = new Rectangle(width, height); rectangle.setFill(color); rectangle.setLayoutX(positionX); rectangle.setLayoutY(positionY); pane.getChildren().add(rectangle); } } class TriangleShape extends Shape { private double[] points; public TriangleShape(double[] points) { this.points = points; this.color = Color.GREEN; } @Override public void calculateArea() { double x1 = points[0]; double y1 = points[1]; doubl

} @Override public void calculatePerimeter() { double side1 = Math.sqrt(Math.pow(points[0] - points[2], 2) + Math.pow(points[1] - points[3], 2)); double side2 = Math.sqrt(Math.pow(points[2] - points...

修改以下代码中的错误并标出 public boolean classify(String text) { String[] words = text.split("\\s+"); double spamScore = 0.0; double hamScore = 0.0; for (String word : words) { if (word.length() < 3) { continue; } word = word.toLowerCase(); if (spamWords.containsKey(word)) { spamScore += Math.log((double) spamWords.get(word) / spamCount); } else { spamScore += Math.log(0.01 / spamCount); } if (hamWords.containsKey(word)) { hamScore += Math.log((double) hamWords.get(word) / hamCount); } else { hamScore += Math.log(0.01 / hamCount); } } return spamScore > hamScore; }

public boolean classify(String text) { String[] words = text.split("\\s+"); double spamScore = 0.0; double hamScore = 0.0; for (String word : words) { if (word.length() ) { continue; } word = ...

改错并重构代码，原始代码如下。# inlude < iostream > using namespace std ; class Box private : double length ;//长度 double breadth ;//宽度 double height ;//高度 int main () Box Box1; //声明Box1，类型为 Box Box Box2; //声明Box2，类型为 Box double volume =0.0; ／用于存储体积 // box 1详述 Box1.height=5.0; Box1.length=6.0; Box1.breadth=7.0; // box 2详述 Box2.height=10.0; Box2.length=12.0; Box2.breadth=13.0; // box 1的体积 volume =Box1.heightBox1.lengthBox1.breadth; cout <<"Box1的体积："<< volume << endl ; // box 2的体积 volume =Box2.heightBox2.lengthBox2.breadth; cout <<"Box2的体积："<< volume << endl ; return 0; (1）请找出并修改代码中的错误； (2）请将修改正确的程序重新改写，保证数据只能由成员函数操作，实现长、宽、高的输入、输出、获取和修改功能。

void setHeight(double hei) { height = hei; } // 获取长、宽、高 double getLength() { return length; } double getBreadth() { return breadth; } double getHeight() { return height; } // ...

优化这段代码import java.util.Scanner;public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入a,b,c,d的值："); double a = sc.nextDouble(); double b = sc.nextDouble(); double c = sc.nextDouble(); double d = sc.nextDouble(); double left = (a + b) * (c + d); double right = a * c + a * d + b * c + b * d; if (left == right) { System.out.println("验证成功！"); } else { System.out.println("验证失败！"); } }}

public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入a,b,c,d的值："); double a = sc.nextDouble(); double b = sc.nextDouble(); double c = sc....

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