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This is a list subtraction example. (\\) :: Eq a => [a] -> [a] -> [a] [] \\ _ = [] xs \\ [] = xs (x:xs) \\ (y:ys) | x == y = xs \\ ys | otherwise = (x : (xs \\ [y])) \\ ys Firstly,

无法使用PHP更新Cookie

I am using a cookie to save a PHP array(0 => 0, 1=>0,,99=>0) and I encode the array into JSON in order to be able to save it in the cookie, the problem is that when I decode the JSON to retrieve

如何使用TfLyn.DATAUTULLS.To-范畴(Y,NBI类)

I am new to python and also to tflearn. I am stuck with the to_categorical function of TFlearn. I read up the documentation and the below is from the website: tflearn.data_utils.to_categorical (y,

返回状态未定义

I'm a noob when it comes to using Redux and I'm running into issues retrieving data from an API and accessing it via Redux props. When I try to access data retrieved by my action it returns undefined.

正则表达式:用一系列项目替换一系列项目

I am working with a plugin for a website that allows me to search and replace with Regex. I have a search text box and a replace text box in the plugin. In the search box I would like to search for

Bootstrap HTML,试图创造一张黑暗的桌子

So, I was looking at https://getbootstrap.com/docs/4.0/content/tables/ and I saw the bg really dark table near the bottom. I took the code and put it into a html doc, it did not work. I played around

用图形读取数据

I am trying to learn igraph in Python and have a csv file that contains network data in the format below, 1 2 1 3 2 4 3 5 and here is how I import it using igraph from igraph import * g =

一个不寻常的浮点舍入误差在Ung/C?

I am using an asset from the Unity Asset Store called World Map Strategy Kit to work on a board game. The kit uses a list of Vector2's with values ranging from -0.5 to +0.5 to determine the borders of

SQL在PostgreSQL中的子查询

I have a table in postgresql, value tag main_tag 1 Tag_A ABC -1 Tag_A BCD 1 Tag_A ABC -1 Tag_B ABC -1 Tag_B BCD 1 Tag_B ABC 1 Tag_B BCD There are three columns value, tag, main_tag. Under each

如何使用Java Spring和JSP将每个项目显示为StPoover之类的网站的一个框?

(read 'item' as 'question' in the above sentence) I'm developing a website like Stackoverflow. On home page, I need to show each question (with its basic details like number of people answered,

Django中的自参照聚合

Is it possible to write a self-referential aggregation in django? For example, given the following model definition: from django.db import models class Match(models.Model): match_id = models.

我想要我的背景图像前面的引导网格

[I want to have the text in front of my background image and not directly underneith it .backgroundimg { background-image: url("../Website Wireframes-18.png"); background-repeat:no-repeat;

在大数据帧中正确连接列表

I have this piece of code import glob all_filenames=glob.glob('13*.VisNO2A') all_filenames.sort() for filename in all_filenames: data=read_datafile(filename) #this is a fuction I defined earlier-

基于HSturt结果中的值加入表

Noobie join question. I am trying to retrieve the value that is in an hstore such as location_id. SELECT * FROM USERS where locations -> '12345679' = 'true'; I then want to take the results and

在JavaScript中分割标签

I am trying to split tags. I have two different types of tags. My objective is to: 1) show only those tags as defined in the regex code. 2) remove those tags NOT defined in the regex code (separate

我如何看待WebPask/中微子在开发中到底在建设什么?

It seems like when you run webpack it builds some dist or src folder with all your bundled code and assets in it, and then automatically has a dev server serve it. How would I see what's in this

我能改变GRIDVIEW的定位和维护功能吗?

I'm following this tutorial: https://www.aspforums.net/Threads/137193/Rotate-Columns-to-Rows-for-GridView-populated-using-SqlDataSource-in-ASPNet/ which is essentially what I'm looking for, however,

需要的建议:.NETFramework vs .NET核心用于基于Web的启动

I am planning to create a website for a SaaS based idea (not decided yet, either in CRM, Blockchain or AI). I read a lot of posts about differences between the two but still could not come to a

Android Mac统一后的白屏

The screen (on my android devices: I tested different android devices, same issue) is completely white after Build and Run. Not showing anything! except for the game name on the top. I also tried only

无法将复杂的Int提升为动力

It seems that raising a Complex Int to a power violates some contract in its instances. Am I wrong on this? minimal example below compl :: Complex Int -> Maybe (Complex Int) compl d = (d^) <$&

与异步和位置监听器有问题

I have been trying to find an answer to this specific question for a few hours now. Sort of reaching my wits end. I've looked though MSDN and here and I have tried a bunch of different ways of doing

文件系统块大小与磁盘块大小

I was reading Hadoop: The Definitive Guide and the following paragraph came up. A disk has a block size, which is the minimum amount of data that it can read or write. Filesystems for a single

将一个文件的内容克隆到另一个[复制]

I am trying to copy the data from one file to another filepath. Here is what I have so far: String filePath = "/Users/david/Desktop/screenshot5.png" FileWriter wr = new FileWriter("/Users/david/

在打印稿中检查装饰类的类型吗?

If we define a decorator function like this: return function IsDefined(object: any, propertyName: string) { . ] Then decorate some property like this: class Test { @IsDefined() p1:

具有固定边位置的图同构

Context: A game of aligning 4-6 pentagon tiles edge to edge to make specific shapes. Match a pattern of 4-6 tiles with a specific pattern of 4-6 tiles. Linked is an image to help with context. match

从通知开始Android扩展活动

I want to start activity MovieNotifActivity from the notification but it doesn't run and shows nothing class MovieNotifActivity: MovieDetailActivity() { @RequiresApi(Build.VERSION_CODES.O) override

HeloCu给出了错误ActureCordd::

My database.yml development: adapter: mysql2 encoding: utf8 reconnect: false database: organic_tomatoes_development pool: 5 username: root password: password test: adapter: mysql2

将脸谱网SDK“激活应用程序”添加到“Apple Dead BeoMeActube”?

Is it necessary to add FBSDKAppEvents.activateApp() to applicationDidBecomeActive when FacebookAutoLogAppEventsEnabled is not set to false? According to FBSDKAppEvents.h it is not necessary:

在调整大小上重新应用Java代码

I have tried looking on stackoverflow about this and found couple suggestions, however I cannot get any of them to work of me. I am trying to ensure the height of divs/javascript updates everytime the

动作电缆

I've been trying to figure out ActionCable with ruby on rails 5.2.0 for a while, but I've been struggling. The goal of my rails app is to have live updates on the "index" view of the Orders scaffold

ANISTITY:追加列表和DICT

I have the following: lxd_containers: - name: "c1" devices: https: { listen: "tcp:{{ lip }}:443", connect: "tcp:{{ cip }}:443", bind:"host", type: "proxy" } proxy: - { name:

VUE2动态表页脚不对齐

I am trying to build an above-basic data table see: https://codesandbox.io/s/mqoy658v9x However the footer cells are too large. I am struggling with the CSS to get them to conform. Under App.vue,

两个共用同一数据的数据库

I have problem with my SQL query. I have two tables In first one I have ID and ID of persons id|id_p|id_p2 1 | 1 | 2 2 | 2 | 3 In second one I have ID of Persons and their names id_p |

括号内未完成的引号

When I try to insert quotes within a bracket they will not complete. The quotes will auto complete if they are on their own but if I put quotes within a bracket it will not complete and will look like

解决数字返回结果的数组关键字

If I loop through the array of strings, and use each string as the key to an associative array, the key that is the string representation of a number cannot "find" its associated value: KeyArray :=

未定义的方法护照::

When trying to run php artisan db:seed for my app, the other seeders run successfully but this one in particular throws the following error: In OAUTHTableSeeder.php line 14: Call to undefined

在JS中区分数组键值的方法有哪些?ARR〔1〕!=比ARR

I was trying to solve a most popular item in array problem. I found some O(n) solutions using maps but nothing that quite works when you have mixed data types, let's say [1,2,1,3,"1","a"] The "1"

I currently cant login to tomcat 9 on mac os. I've tried all the suggestions such as server stop/restart after making file updates, seperate logins for gui manager vs. other role and updated the

WebSoCultOnMead事件只被触发一次

I'm using a basic WebSocket client within Angular 6 application. Everything works except for some reason both socket.onmessage or socket.addEventListener('message' are fired only once. No errors on

为什么抽象语法树是必需的?为什么递归下降分析器不能解析呢?

I am a beginner when it comes to interpreter design and after learning a little about language design (grammars, language, lexers, parsers), I don't understand why it is necessary for the parser to

是否有任何带有显式纯修饰符的语言

Are there are any languages with an explicit compiler-enforced pure modifier apart from Solidiy? I know that some tools allow marking functions as pure for static analysis, e.g. @Contract annotation

订单MySQL的最佳匹配结果

Ok so imagine this mysql query SELECT * FROM table WHERE table_string RLIKE '[[:<:]]this[[:>:]]' OR table_string RLIKE '[[:<:]]is[[:>:]]' OR table_string RLIKE '[[:<:]]test[[:>:]

如何设置一个参数的权重

Now set of sizes of block look like: weight="811px" & height="811px". How set one parameter for weight & height if block have square/quadrant form? May be size="811px" or quadro="811px" :-) ?

获取Windows上\\xYZ网络上共享的文件夹名

I am trying to get list of all Folders shared on network \XYZ , I am able to access each folder if I provide folder name like below code. OS.listdir('\\\\XYZ\\folder1') But I want every folder name

约束布局底部按钮被关闭屏幕

enter image description here As you can see in the image, i have a constraint layout and inside i have another constraint layout, and 3 objects aligned vertically, at the top other constraint layout,

如何在Django中从一个模型获得另一个模型中的值

I am new to Django so please be kind -_^. I have two models "cats" and "litters". Litters contain two elements with names. I have a bunch of Cats. I want it so as a user, I can associate any cat

删除包含多个行的所有行

I have like that: a1@305@ a50@21 b6@@ The first and the last lines should be removed because they contain more than one @ What should be the regex for that? Any help would be

如何用OpenCV Python调整面罩的大小?

I would like to obtain a mask for a small (resized) image (800x600). Then I would like to resize the mask and apply it to the larger image (3000x2000). What would be the best practice for this purpose?

从GITWiKi创建GITBoo/PDF的最小步骤是什么?

Similar questions: Create gitbook from github wiki pages , How to import a markdown file from github into local gitbook I need to read some documentation, and wish to save it all as PDFs (to read on

我怎样才能让因特利捷终端与OH我的ZSH一起正常工作?

I love Oh My Zsh, but it has never worked properly in the JetBrains product's Terminals: cannot find executables cannot use version managers like pyenv, sdkman, rvm Oh My Zsh is zsh shell

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