计算Pi randomGen [英] Calculating Pi randomGen

问题描述

我的代码尝试使用monte carlo方法时出现问题。这就是我到目前为止所看到的，但我认为我的计算中可能存在错误：

我一直在为我计算的PI得到同样的东西而且我在疯狂。我想我会休息一天，也许有新鲜眼睛的人可能知道我哪里出错了。

I am having problems with my code trying to use the monte carlo method. This is what I have so far but think there might be a error in my calculations:
I keep getting the same thing for my calculated PI and I am driving myself mad. I think I am going to take a break for a day and maybe someone with fresh eyes might know where I went wrong.

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推荐答案

你只需要''射击'一次，然后你开始你的循环，你用

进行数学运算的结果。我期待这样的事情：

You only ''shoot'' once and then you start your loop and you do the math with
the result of that single shot. I expected something like this:

展开 | 选择 | Wrap | 行号

You只有''射击''一次，然后你开始你的循环，你用

进行数学运算的结果。我期待这样的事情：

You only ''shoot'' once and then you start your loop and you do the math with
the result of that single shot. I expected something like this:

展开 | 选择 | Wrap | 行号

这就是我所拥有但它仍然没有解决的问题计算正确??任何人？我在绳子尽头。我认为程序本身运行得很好，但我只是遇到了一些正确运行的问题。


import java.util。*;


public class CalculatePI

{

public static boolean isInside（double xPos，double yPos）

{

布尔结果;

双倍距离= Math.sqrt（（xPos * xPos）+（yPos * yPos））;

if（距离< 1）

result = true;

返回（距离< 1）;

}


public static double computePI（int numThrows）

{

随机randomGen = new随机（System.currentTimeMillis（））;

double xPos =（randomGen.nextDouble（））* 2 - 1.0;

double yPos =（randomGen.nextDouble（））* 2 - 1.0;

boolean isInside = isInside（xPos，yPos）;

int hits = 0;

double PI = 0;


for（int i = 0; i< = numThrows; i ++）

{

xPos =（randomGen.nextDouble （））* 2 - 1.0;

yPos =（randomGen.nextDouble（））* 2 - 1.0;

if（isInside（xPos，yPos））

{

// hits = hits + 1;

// PI = 4 *（hits / numThrows）;

点击++;

}

}

返回PI;

}


public static void main（String [] args）

{

扫描仪读卡器= new Scanner（System.in）;

System.out.println（此程序使用蒙特卡罗方法计算PI。）;

System.out .print（请输入投掷次数：）;

int numThrows = reader.nextInt（）;

double PI = computePI（numThrows）;

double差异= PI - Math.PI;

System.out.println（" throws =" + numThrows +"，Computed PI =" + PI +"，差异=" +差异）;

}

}

This is what I have but it is still not working out the calculations correctly?? Anybody? I am at the end of my rope. I think the program itself works out pretty well but I am just having some problems getting to run correctly.

import java.util.*;

public class CalculatePI
{
public static boolean isInside (double xPos, double yPos)
{
boolean result;
double distance = Math.sqrt((xPos * xPos) + (yPos * yPos));
if (distance < 1)
result = true;
return(distance < 1);
}

public static double computePI ( int numThrows )
{
Random randomGen = new Random (System.currentTimeMillis() );
double xPos = (randomGen.nextDouble()) * 2 - 1.0;
double yPos = (randomGen.nextDouble()) * 2 - 1.0;
boolean isInside = isInside(xPos, yPos);
int hits = 0;
double PI = 0;

for (int i = 0; i <= numThrows; i++)
{
xPos = (randomGen.nextDouble()) * 2 - 1.0;
yPos = (randomGen.nextDouble()) * 2 - 1.0;
if (isInside(xPos, yPos))
{
//hits = hits + 1;
//PI = 4 * (hits/numThrows);
hits++;
}
}
return PI;
}

public static void main (String[] args)
{
Scanner reader = new Scanner (System.in);
System.out.println("This program calculates PI using the Monte Carlo method.");
System.out.print("Please enter number of throws: ");
int numThrows = reader.nextInt();
double PI = computePI(numThrows);
double Difference = PI - Math.PI;
System.out.println ("Number of throws = " + numThrows + ", Computed PI = " + PI + ", Difference = " + Difference );
}
}

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