生成random随机数，OF中该怎样实现？

[yuanlee2011]

• 列表

[东岳]

https://coding.net/u/dyfluid/p/Solvers_DYFLUID/git/tree/master/randomNumber

[yuanlee2011]

若想得到服从高斯分布的随机数，应该怎样修改？

[东岳]

已更新，

https://coding.net/u/dyfluid/p/Solvers_DYFLUID/git/blob/master/randomNumber/randomNumber.C

[yuanlee2011]

@李东岳 谢谢！

[yuanlee2011]

@李东岳 发现不同的seed值对应一系列不同的随机数(组)，请问seed有什么意义？赋值时应注意哪些问题？

[东岳]

Foam::scalar Foam::Random::scalar01()
{
    return osRandomDouble();
}

-> OSspecific/POSIX/POSIX.C

Foam::scalar Foam::osRandomDouble()
{
#ifdef USE_RANDOM
    return (scalar)random()/INT_MAX;
#else
    return drand48();
#endif
}

->

http://www.cplusplus.com/forum/beginner/39274/

http://blog.csdn.net/langeldep/article/details/7192906

具体的对于C++随机数这个东西我没有太细研究过，只能随便找找，你看看有没有帮助。

[浪迹天大]

刚刚运行了一下代码，发现 seed 给定之后，重复运行代码，得到的随机数永远是相同的。
正如CFD-Online 的这篇帖子(#12)所说：A random number generator generates a "pseudo"-random number from the previous number. The number you give to the constructor is the start of the sequence (the predescessor of your first random number)

另外 Random 的构造函数中的 seed 是有限制的：

Foam::Random::Random(const label seed)
{
    if (seed > 1)
    {
        Seed = seed;
    }
    else
    {
        Seed = 1;
    }

    osRandomSeed(Seed);
}

[东岳]

随便找了找 http://www.cplusplus.com/reference/cstdlib/rand/

This number is generated by an algorithm that returns a sequence of apparently non-related numbers each time it is called. This algorithm uses a seed to generate the series, which should be initialized to some distinctive value using function srand.

你试试纯C++吧

[星星星星晴]

@东岳 顺手请问一下如何生成随机向量，其模为1

[星星星星晴]

@星星星星晴 傻了 知道了