random_shuffle种子 [英] random_shuffle seed

问题描述

我正在调用random_shuffle而不传入RandomNumberGenerator

并且每次重新启动程序时都会进行相同的随机播放。显然

我需要为内部随机数生成器播种。但是怎么样？我不能用b $ b找到任何办法，如果没有，那么内部

随机数发生器怎么有用？


谢谢，

-peter

I''m calling random_shuffle without passing in a RandomNumberGenerator
and getting the same shuffle every time I restart my program. Apparently
I need to seed the internal random number generator. But how? I can''t
find any way to do that, and if there is none, then how is the internal
random number generator useful?

Thanks,
-peter

推荐答案

" Peter Ammon" < PE ********* @ rocketmail.com>写道...

"Peter Ammon" <pe*********@rocketmail.com> wrote...

我正在调用random_shuffle而不传入RandomNumberGenerator
并且每次重新启动程序时都会进行相同的随机播放。显然
我需要播种内部随机数生成器。但是怎么样？我无法找到任何方法，如果没有，那么内部
随机数生成器如何有用？

I''m calling random_shuffle without passing in a RandomNumberGenerator
and getting the same shuffle every time I restart my program. Apparently
I need to seed the internal random number generator. But how? I can''t
find any way to do that, and if there is none, then how is the internal
random number generator useful?

了解''srand''的功能。


V

Read about ''srand'' function.

V

" Peter阿蒙" < PE ********* @ rocketmail.com>在消息中写道

news：bn ********** @ news.apple.com ...

"Peter Ammon" <pe*********@rocketmail.com> wrote in message
news:bn**********@news.apple.com...

我正在调用random_shuffle而没有传入一个RandomNumberGenerator
每次重新启动程序时都会进行相同的随机播放。显然
我需要播种内部随机数生成器。但是怎么样？我无法找到任何方法，如果没有，那么内部
随机数生成器如何有用呢？

谢谢，
-peter

I''m calling random_shuffle without passing in a RandomNumberGenerator
and getting the same shuffle every time I restart my program. Apparently
I need to seed the internal random number generator. But how? I can''t
find any way to do that, and if there is none, then how is the internal
random number generator useful?

Thanks,
-peter

查找srand（）函数。虽然乍一看似乎很愚蠢，但是生成伪随机的生成器是一个生成伪随机的生成器。在
启动时使用相同种子的数字（例如，每次运行

程序时没有指定不同的种子），将为您提供可重复的随机序列。数字。这是

非常有用，如果你想调试模拟的行为

例子。


BTW你应该使用在您的计划中只有一次！


HTH

Chris

Look up the srand() function. Although it seems stupid at first glance, a
generator producing "pseudo-random" numbers using always the same seed at
startup (e.g. without specifying a different seed every time you run the
program), will give you a reproducable sequence of "random" numbers. This is
very helpful in case you want to debug the behavior of a simulation for
example.

BTW you should use srand only once in your program!!

HTH
Chris

Chris Theis写道：< br>

Chris Theis wrote:

Peter Ammon < PE ********* @ rocketmail.com>在消息中写道
新闻：bn ********** @ news.apple.com ...

"Peter Ammon" <pe*********@rocketmail.com> wrote in message
news:bn**********@news.apple.com...

我正在调用random_shuffle而没有传入一个RandomNumberGenerator
每次重新启动程序时都会进行相同的随机播放。显然
我需要播种内部随机数生成器。但是怎么样？我无法找到任何方法，如果没有，那么内部
随机数生成器如何有用呢？

谢谢，
-peter

I''m calling random_shuffle without passing in a RandomNumberGenerator
and getting the same shuffle every time I restart my program. Apparently
I need to seed the internal random number generator. But how? I can''t
find any way to do that, and if there is none, then how is the internal
random number generator useful?

Thanks,
-peter

查找srand（）函数。虽然乍一看似乎是愚蠢的，但是生成伪随机的生成器。在启动时始终使用相同种子的数字（例如，每次运行
程序时未指定不同的种子），将为您提供可重复的随机序列。数字。如果您想调试模拟的行为，这非常有用。

顺便说一句，您应该只在程序中使用一次srand !!

HTH
Chris

Look up the srand() function. Although it seems stupid at first glance, a
generator producing "pseudo-random" numbers using always the same seed at
startup (e.g. without specifying a different seed every time you run the
program), will give you a reproducable sequence of "random" numbers. This is
very helpful in case you want to debug the behavior of a simulation for
example.

BTW you should use srand only once in your program!!

HTH
Chris

random_shuffle显然不必使用rand（）作为其内部

PRNG ;看看我对Bazarov先生的回应。


-Peter

random_shuffle evidently doesn''t have to use rand() as its internal
PRNG; see my response to Mr. Bazarov.

-Peter

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