shuffle | 易学教程

java: card shuffle,

阅读更多关于 java: card shuffle,

问题 This is a interview-questions. Please give some hints: Use vector to implement a method, shuffle a deck of Card. public class Card { private int value; Card(int v) { value = v; } public void print(){ System.out.print(value+";"); } } public class DeckShuffle { private final int num; Vector<Card> deck = new Vector<Card>(); // implement this shuffle function. DO NOT USE Collections.shuffle() !! public void shuffle(){ // your code goes here! } } 回答1: The code for Collections.shuffle() can be

jQuery shuffle table rows

阅读更多关于 jQuery shuffle table rows

问题 I got a table with three columns: 1 A A 2 B B 3 C C 4 D D What I want to do is to shuffle the table rows but only the second and third column, like the example below 1 C C 2 A A 3 D D 4 B B I found a nifty plugin wich lets the table rows to be shuffled http://www.yelotofu.com/2008/08/jquery-shuffle-plugin/ but I want to keep the first column in it's default order. Either I will reorder the first column after shuffling or I just shuffle the second and third column. Either way can somebody help

shuffling a list with restrictions in Python

阅读更多关于 shuffling a list with restrictions in Python

问题 I have a problem with randomizing a list with restrictions in Python (3). I have seen a few other questions relating to this, but none of them really seem to solve my problem. I'm a beginner, so any help is much appreciated! I'm designing an experiment using two types of stimuli: shapes and colors (four of each). I need to generate permutations of all 16 combinations, which I have done with random.shuffle-function: import random # letters are shapes, numbers are colors x=["a1","a2","a3","a4",

Randomizing array elements

阅读更多关于 Randomizing array elements

问题 I have an array @number = [1,2,3,4,5,6,7,8,9] Now, I want to randomize the array content... something like eg: [5,3,2,6,7,1,8] Please guide me how to proceed with it. 回答1: Use the shuffle method ... irb(main):001:0> [1,2,3,4,5].shuffle => [3, 4, 2, 5, 1] 回答2: the shuffle command returns a randomized version of an array eg: [1,2,3].shuffle => [2,3,1] 回答3: [1,2,3,4,5,6,7,8,9].sort_by {rand}[0,9] => [5, 7, 3, 8, 9, 4, 2, 1, 6] 回答4: If you are using old version of ruby... this will work def

Scala: Random List of Val Order

阅读更多关于 Scala: Random List of Val Order

问题 I have some of val that should randomly coming to list of result. Here's the code: def motivation(name:String, score:Int){ val quote1 = "You're not lost. You're locationally challenged." //score=10 val quote2 = "Time is the most valuable thing a man can spend." //score=20 val quote3 = "At times one remains faithful to a cause." //score=10 val quote4 = "Only because its opponents do not cease to be insipid." //score=10 val quote5 = "Life can be complicated." //score=20 case Some(score) => val

Spark技术内幕：如何解决Shuffle Write一定要落盘的问题？

阅读更多关于 Spark技术内幕：如何解决Shuffle Write一定要落盘的问题？

抓发自阿里云社群： https://yq.aliyun.com/articles/2792 在Spark 0.6和0.7时，Shuffle的结果都需要先存储到内存中（有可能要写入磁盘），因此对于大数据量的情况下，发生GC和OOM的概率非常大。因此在Spark 0.8的时候，Shuffle的每个record都会直接写入磁盘，并且为下游的每个Task都生成一个单独的文件。这样解决了Shuffle解决都需要存入内存的问题，但是又引入了另外一个问题：生成的小文件过多，尤其在每个文件的数据量不大而文件特别多的时候，大量的随机读会非常影响性能。Spark 0.8.1为了解决0.8中引入的问题，引入了FileConsolidation机制，在一定程度上解决了这个问题。由此可见，Hash Based Shuffle在Scalability方面的确有局限性。而Spark1.0中引入的Shuffle Pluggable Framework，为加入新的Shuffle机制和引入第三方的Shuffle机制奠定了基础。在Spark1.1的时候，引入了Sort Based Shuffle；并且在Spark1.2.0时，Sort Based Shuffle已经成为Shuffle的默认选项。但是，随着内存成本的不断下降和容量的不断上升，Spark Core会在未来重新将Shuffle的过程全部是in

How to really shuffle a deck of cards

阅读更多关于 How to really shuffle a deck of cards

问题 When I need to shuffle a deck of poker cards in Java/Android, I use Collections.shuffle(List<?> list) , of course. I've ever been doing this and the results seemed acceptable. But they aren't. As outlined in this paper, there are 52! possible unique shuffles of a 52 card poker deck. That amounts to about 2^226. But Collections.shuffle(List<?> list) uses new Random() by default which uses a 48-bit seed and can therefore only create 2^48 unique shuffles - which is only 3.49*10^(-52) percent of

Shuffle two list at once with same order

阅读更多关于 Shuffle two list at once with same order

问题 I'm using nltk corpus movie_reviews where are a lot of documents. My task is get predictive performance of these reviews with pre-processing of the data and without pre-processing. But there is problem, in lists documents and documents2 I have the same documents and I need shuffle them in order to keep same order in both lists. I cannot shuffle them separately because each time I shuffle the list, I get other results. That is why I need to shuffle the at once with same order because I need

Shuffle two list at once with same order

阅读更多关于 Shuffle two list at once with same order

Shuffle two list at once with same order

阅读更多关于 Shuffle two list at once with same order