问题描述
下面的代码生成一个N个整数随机数的数组，并将结果存储在random_int_array
The code below generates an array of N integer random numbers and stores the result in random_int_array
N=20
allocate(array(N/2))
call random_seed
call random_number(array)
random_int_array=int(array*N)
问题是我可能会在random_int_array中生成重复项，但我不希望这样.如何从该数组中删除重复项，或者等效地，如何生成一组唯一的随机数?
The problem is that I might generates duplicates in random_int_array and I don't want that. How can I remove the duplicate from this array or, equivalently, how can I generate a set of unique random numbers?
请注意，array的尺寸为N/2.因此，问题基本上是从N中提取出N/2个数字，没有重复项.
Note that array has a dimension N/2. So the problem is basically extract N/2 numbers, without duplicates, out of N.
推荐答案
听起来您需要随机排列的1到19之间的整数.这将是这些整数的混洗.参见例如 http://tekpool.wordpress.com/2006/10/06/shuffling-shuffle-a-deck-of-cards-knuth-shuffle/或 http://en.wikipedia.org/wiki/Fisher-Yates_shuffle
It sounds like you want the integers from 1 to 19 in random order. This would be a shuffle of those integers. See, e.g., http://tekpool.wordpress.com/2006/10/06/shuffling-shuffle-a-deck-of-cards-knuth-shuffle/ or http://en.wikipedia.org/wiki/Fisher-Yates_shuffle
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