计算大的浮点数快如0.4 ^亿,,什么想法？ [英] Calculating big float number fast like 0.4 ^ 100000000 ,, any ideas?

问题描述

埃姆...我有一个问题
我有一定的计算导致超过10 ^ -308（双.NET最大的值）的任何方式解决了我通过一个叫做BIGFLOAT <库这个问题A HREF =htt​​p://www.fractal-landscapes.co.uk/bigint.html相对=nofollow> http://www.fractal-landscapes.co.uk/bigint.html ，

Ehm ... I got a problem I've a certain calculation that result is over 10^-308 (the biggest value in double .net ) any way I solved this problem through a library called BIGFLOAT http://www.fractal-landscapes.co.uk/bigint.html ,

我需要计算像0.4 ^（1000或100000000）需要非常非常长的时间，我没有研究并行或分布式编程问题还什么都但我需要一个解决方案，快速，可以理解为我
我打算在明年6小时交付这个项目！ ：D

What ever I need to calculate something like 0.4 ^(1000 or 100000000) the problem it takes very very long time I didn't study parallel or distributed programming yet but I need a solution that is fast and understandable for me I'm going to deliver this project in next 6 Hours!! :D

下面的代码：

private BigFloat getBlocking(double k)
    {
        double p1, p2;
        BigFloat p3;
        p3 = new BigFloat(pp);
        p1 = this.P / (double)(k / (double)this.N);
        p2 = Math.Pow((1 - p1), 2);
        p3= new BigFloat(1-p2,pp);
        p3.Pow((int)k);
        return p3;

    }

其中，K为1000，N为1001

where K is 1000 , N is 1001

推荐答案

下载和参考，微软的J＃.net库从C＃项目 - 这样就可以使用J＃的BigDecimal的实施

Download, and reference, the Microsoft J# .NET Library from your C# project - so that you can use J#'s BigDecimal implementation.

请参阅：

的任意精度的小数在C＃

大十进制：

安装J＃运行库（免费）：
的 http://www.microsoft.com/downloads/en/details.aspx?familyid=f72c74b3-ed0e-4af8-ae63-2f0e42501be1&displaylang=en

Install the J# runtime (it's free): http://www.microsoft.com/downloads/en/details.aspx?familyid=f72c74b3-ed0e-4af8-ae63-2f0e42501be1&displaylang=en

和

的Arbitrary精度小数

和

的http：// geekswithblogs。净/ gyoung /存档/ 2006/05/01 / 76869.aspx

J＃重distributables含有非常

BigInteger和BigDecimal的，你可以在你的.NET应用程序直接
采用行之有效的实现只通过引用J＃组装
vjslib.dll
。
的http：/ /download.microsoft.com/download/2/e/9/2e9bde04-3af1-4814-9f1e-733f732369a3/NETMatters0512.exe
讨论这进一步。它也
contins这是
非常有用的一些zip类

The J# re-distributables contain very well tested implementations of BigInteger and BigDecimal that you can use directly in your .NET apps simply by referencing the J# assembly vjslib.dll. http://download.microsoft.com/download/2/e/9/2e9bde04-3af1-4814-9f1e-733f732369a3/NETMatters0512.exe discusses this further. It also contins some Zip classes which are quite useful.

和

MSDN - BigInteger，以GetFiles的，和更多

虽然你可以在网上搜索找到实现在C＃，
C ++中的
多如牛毛，和多种其它语言的，
它可能不是必要的。如果你
不介意在
J＃库的依赖，你已经在你
处置大
号实施。事实上，你有两个。在
J＃运行时库，vjslib.dll，可作为可再发行
组分
，就像.NET
框架。您可以从
的Visual J＃下载下载（它也安装$通过可视
工作室的先决条件B $ B）。以同样的方式，一个C＃
或C ++应用程序可以使用
Microsoft.VisualBasic.dll中（可视
Basic运行时库），C＃，可视
Basic®的和C ++应用程序可以使用
中的J＃运行时库和
无数有趣类是
暴露。

While you can search the Web to find a plethora of implementations in C#, C++, and a variety of other languages, it might not be necessary. If you don't mind taking a dependency on the J# libraries, you already have a big number implementation at your disposal. In fact, you have two. The J# run-time library, vjslib.dll, is available as a redistributable component, just like the .NET Framework. You can download it from Visual J# Downloads (it's also installed as a prerequisite by Visual Studio®). In the same manner that a C# or C++ application can make use of Microsoft.VisualBasic.dll (the Visual Basic run-time library), C#, Visual Basic®, and C++ applications can use the J# run-time library and the numerous interesting classes it exposes.

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