Question

在fortran中rand()的用法是怎样的?麻烦举个例子

Answer 1

rand()不大好用，用这个：
0-1之间类似于

program test
implicit none
real :: x
call random_seed()! 系统根据日期和时间随机地提供种子"
call random_number(x)
print *,x
end program

另外，在一个程序中， "call random_seed () 这一句是不能重复的，只能用一次。
所以它不能放到循环里面去，另外，如果一个子程序会被调用多次的话，也不能放到子程序里面。

＝＝＝＝＝＝＝＝＝＝＝＝＝＝
如果你非得用rand()的话，看看这个帖子吧：
http://bbs.pfan.cn/post-276179.html

Answer 2

c--
c rand.f: A sample program to generate a pseudorandom number sequence.
c This program prints ten numbers between 0.0 and 1.0, and it also
c prints a different sequence each time (unless you run it a LOT of
c times---the rand() functon is, after all, only pseudorandom).
c--
program rand
real rand ! Declare the type of the rand() function
integer i ! Counts random numbers
integer*4 timeArray(3) ! Holds the hour, minute, and second
c--
c In order to get a different sequence each time, we initialize the
c seed of the random number function with the sum of the current
c hour, minute, and second.
c--
call itime(timeArray) ! Get the current time
i = rand ( timeArray(1)+timeArray(2)+timeArray(3) )
c--
c Calling rand() with an argument of zero generates the next number
c in sequence.
c--
do i = 1, 10
print *, rand(0)
end do
stop
end

把它作为一个子程序
挺好用的
我经常用它

Answer 3

照下面的代码，rnd就是生成的随机数，大于0小于1。请注意，作为计算机来说，对任何语言，生成的随机数都不是真正随机的，近似而已。
INTEGER iseed
REAL*8 rnd
iseed = 425001

rnd = RAN(iseed)

Answer 4

用random_number