Each time rand() is seeded with the same seed, it must produce the same sequence of values. It should not be seeded every time we need to generate a new set of numbers. The algorithm used in rand function uses a seed to generate the series, which should be initialized to some distinctive value using srand. Besides MersenneTwister, Julia also provides the RandomDevice RNG type, which is a … If you don’t call srand before your first call to rand, it’s as if you had called srand(1) to set the seed to one. srand()用来设置rand()产生随机数时的随机数种子。 参数seed必须是个整数，通常可以利用time(0)的返回值或NULL来当做seed。 如果每次seed都设相同值，rand()所产生的随机数值每次就会一样。 程序例: Other RNG types can be plugged in by inheriting the AbstractRNG type; they can then be used to have multiple streams of random numbers. The srand() function sets its argument, which is of type int, as the seed for a new sequence of numbers to be returned by rand().

C library function - srand() - The C library function void srand(unsigned int seed) seeds the random number generator used by the function rand. The initstate() and setstate() functions handle restarting and changing random-number generators. Defined in header void srand (unsigned seed ); Seeds the pseudo-random number generator used by rand() with the value seed. Like rand(), random() produces by default a sequence of numbers that can be duplicated by calling srandom() with 1 as the seed. This algorithm uses a seed to generate the series, which should be initialized to some distinctive value using function srand. The function rand() is not reentrant or thread-safe, since it uses hidden state that is modified on each call. rand() 関数は、0 から RAND_MAX ( で定義されるマクロ) までの範囲の疑似乱数整数を生成します。 rand() を呼び出す前に srand() 関数を使用して、乱数発生ルーチンの開始点を設定します。最初に srand() 関数を呼び出さない場合、デフォルトの seed は 1 です。 Use the srand() function before calling rand() to set a starting point for the random number generator. It means that if no srand () is called before rand (), the rand () function behaves as if it was seeded with srand (1). In order to generate random-like numbers, srand is usually initialized to some distinctive runtime value, like the value returned by function time (declared in header ).
srand() sets the seed which is used by rand to generate “random” numbers.

It is a good practice to seed the pseudo random number generator only once at the beginning of the program and before any calls of rand().
Random Numbers. Julia has a global RNG, which is used by default. A call to the rand() function (header file stdlib.h), with no arguments, returns a fairly good approximation to a random integer in the range 0 to RAND_MAX (defined in stdlib.h). RAND_MAX is a constant defined in . So don't use it with threaded code. The seed for rand () function is 1 by default. The rand() function generates a pseudo-random integer in the range 0 to RAND_MAX (macro defined in ). #include int : rand (void) Description Rand function returns a pseudorandom number. rand() 関数は、0 から RAND_MAX ( で定義されるマクロ) までの範囲の疑似乱数整数を生成します。 rand() を呼び出す前に srand() 関数を使用して、乱数発生ルーチンの開始点を設定します。最初に srand() 関数を呼び出さない場合、デフォルトの seed は 1 です。 表头文件：#include 定义函数：void srand (unsigned int seed); 函数说明： srand()用来设置rand()产生随机数时的随机数种子。参数seed必须是个整数，通常可以利用geypid()或time(0)的返回值来当做seed。如果每次seed都设相同值，rand()所产生的随机数值每次就会一样。 范例 Declaration Following is the declaration for rand() function. Use rand_r (or drand48_r if you're on linux/glibc). Seed = 1, Random number = 41 Seed = 5, Random number = 54. The srandom() function initialises the current state array using the value of seed. Random number generation in Julia uses the Mersenne Twister library via MersenneTwister objects. RAND_MAX is a constant whose default value may vary between implementations but it is granted to be at least 32767. If rand() is used before any calls to srand(), rand() behaves as if it was seeded with srand(1). If seed is set to 1, the generator is reinitialized to its initial value and produces the same values as before any call to rand or srand. Seed each RNG with a different value (you could seed a first RNG in the main thread to produce random seeds for the ones in each thread). The srand () function in C++ seeds the pseudo random number generator used by the rand () function. Generate Random Number A typical way to generate trivial pseudo-random numbers in a determined range using rand is to use the modulo of the returned value by the range span and add the initial value of the range: If you do not call the srand() function first, the default seed is 1. In short, srand() — Set Seed for rand() Function .


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