首页 \ 问答 \ Matlab:获取有序对的列表(Matlab: Get list of ordered pairs)

Matlab:获取有序对的列表(Matlab: Get list of ordered pairs)

让我用一个例子来解释:如果我给'4'作为输入,我想要对(1,2),(1,3),(1,4),(2,3),(2,4), (3,4)在这样的矩阵中:

1 2
1 3
1 4
2 3
2 4
3 4

我为什么需要这个? 我将生成一个从1到(n *(n-1)/ 2)的随机数,我想要相应的对。 我想我会首先生成配对列表,然后使用随机数作为索引。 如果有一个直接的解决方案,那就好多了!

编辑:实际上我不需要所有对,我需要随机排序的对不重复和第一个值<第二个值。 有5000个列表,每个列表有n个元素。 所以可能的总对是tot = 5000 * n *(n-1)/ 2。 如果我使用randperm从1到tot生成t随机整数,我可以将它翻译成一对吗? 我可以通过除以5000获得列表编号。如果我用5000修改,我将得到对索引。 我试图将这对索引转换成一对。 很抱歉没有解释所有这些。 希望我很清楚。


Let me explain with an example: If I give '4' as input, I want the pairs (1,2), (1,3), (1,4),(2,3),(2,4),(3,4) in a matrix like so:

1 2
1 3
1 4
2 3
2 4
3 4

Why do I need this? I will generate a random number from 1 to (n*(n-1)/2) and I want the corresponding pair. I figured I will generate the pair list first and then use the random number as an index. If there is a direct solution to this, then much better!

Edit: Actually I don't need all pairs, I need t random ordered pairs that don't repeat and first value < second value. There are 5000 lists each with n elements. So total pairs possible is tot = 5000 * n * (n-1)/2. If I generate t random integers from 1 to tot using randperm, can I translate it into a pair? I can get the list number by dividing by 5000. And if I mod with 5000, I will get pair index. I was trying to convert this pair index into a pair. Sorry for not explaining all this before. Hope I am clear.


原文:https://stackoverflow.com/questions/29983979
更新时间:2023-05-31 09:05

最满意答案

所以

(sc.parallelize(ThirdPartyLib.getX)).asInstanceOf[RDD[XData]]

你先并行化,然后再施法。 所以spark仍然需要ThirdPartyLib.models.XData可序列化。 此类演员可能会爆炸,因为类型不同。

我认为这应该可以解决问题

def convertThirdPartyXDataToMyXData( xd: ThirdPartyLib.models.XData): XData = ???

val data: RDD[ThirdPartyLib.models.XData] = sc.parallelize(ThirdPartyLib.getX.map(convertThirdPartyXDataToMyXData)) //if you have a map on the collection that getX returns

So with

(sc.parallelize(ThirdPartyLib.getX)).asInstanceOf[RDD[XData]]

you parallelize first and then cast. so spark still requires ThirdPartyLib.models.XData to be serializable. Also that cast would probably explode because the types aren't the same.

I think this should do the trick

def convertThirdPartyXDataToMyXData( xd: ThirdPartyLib.models.XData): XData = ???

val data: RDD[ThirdPartyLib.models.XData] = sc.parallelize(ThirdPartyLib.getX.map(convertThirdPartyXDataToMyXData)) //if you have a map on the collection that getX returns

相关问答

更多

相关文章

更多

最新问答

更多
  • 您如何使用git diff文件,并将其应用于同一存储库的副本的本地分支?(How do you take a git diff file, and apply it to a local branch that is a copy of the same repository?)
  • 将长浮点值剪切为2个小数点并复制到字符数组(Cut Long Float Value to 2 decimal points and copy to Character Array)
  • OctoberCMS侧边栏不呈现(OctoberCMS Sidebar not rendering)
  • 页面加载后对象是否有资格进行垃圾回收?(Are objects eligible for garbage collection after the page loads?)
  • codeigniter中的语言不能按预期工作(language in codeigniter doesn' t work as expected)
  • 在计算机拍照在哪里进入
  • 使用cin.get()从c ++中的输入流中丢弃不需要的字符(Using cin.get() to discard unwanted characters from the input stream in c++)
  • No for循环将在for循环中运行。(No for loop will run inside for loop. Testing for primes)
  • 单页应用程序:页面重新加载(Single Page Application: page reload)
  • 在循环中选择具有相似模式的列名称(Selecting Column Name With Similar Pattern in a Loop)
  • System.StackOverflow错误(System.StackOverflow error)
  • KnockoutJS未在嵌套模板上应用beforeRemove和afterAdd(KnockoutJS not applying beforeRemove and afterAdd on nested templates)
  • 散列包括方法和/或嵌套属性(Hash include methods and/or nested attributes)
  • android - 如何避免使用Samsung RFS文件系统延迟/冻结?(android - how to avoid lag/freezes with Samsung RFS filesystem?)
  • TensorFlow:基于索引列表创建新张量(TensorFlow: Create a new tensor based on list of indices)
  • 企业安全培训的各项内容
  • 错误:RPC失败;(error: RPC failed; curl transfer closed with outstanding read data remaining)
  • C#类名中允许哪些字符?(What characters are allowed in C# class name?)
  • NumPy:将int64值存储在np.array中并使用dtype float64并将其转换回整数是否安全?(NumPy: Is it safe to store an int64 value in an np.array with dtype float64 and later convert it back to integer?)
  • 注销后如何隐藏导航portlet?(How to hide navigation portlet after logout?)
  • 将多个行和可变行移动到列(moving multiple and variable rows to columns)
  • 提交表单时忽略基础href,而不使用Javascript(ignore base href when submitting form, without using Javascript)
  • 对setOnInfoWindowClickListener的意图(Intent on setOnInfoWindowClickListener)
  • Angular $资源不会改变方法(Angular $resource doesn't change method)
  • 在Angular 5中不是一个函数(is not a function in Angular 5)
  • 如何配置Composite C1以将.m和桌面作为同一站点提供服务(How to configure Composite C1 to serve .m and desktop as the same site)
  • 不适用:悬停在悬停时:在元素之前[复制](Don't apply :hover when hovering on :before element [duplicate])
  • 常见的python rpc和cli接口(Common python rpc and cli interface)
  • Mysql DB单个字段匹配多个其他字段(Mysql DB single field matching to multiple other fields)
  • 产品页面上的Magento Up出售对齐问题(Magento Up sell alignment issue on the products page)