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Recent questions in Technique[技术]
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dataframe - How do I remove specified rows from a data frame in R, but the rows are eliminated according to another column variable?
I have a data frame of values, with variable names that correspond to co-ordinates and event time per simulation. head_data<-structure(list(x = c(987.353265152362, 570 ... But I need a more efficient way of doing so for a larger data frame....
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c++ - Eigen templated function that accepts both Matrix col and vector
I can't understand how to write templated function that accepts both vector and matrix column? For example: template<typename T> void foo( const Eigen::MatrixX< ... I would like to pass dynamic size vector and, but not necessary, fixed size...
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做vue SSR,之前在html中通过CDN引入的代码,现在是不是必须改用本地引入?如vue, element-ui,axios
还有 vuex 等。 本地引入的话,那如何优化?...
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if statement - Who to » State if two are numbers Co-Primes A (8 bit ) and B (8 bit) ,State if A is T-Prime or not Using VHDL
Using VHDL who to ? State if two are numbers Co-Primes A (8 bit ) and B (8 bit) ,State if A is T-Prime or not...
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中文编程需要文本编辑器或者IDE的支持
我把C++程序里的类名、成员函数换成中文,运行可以,但是源代码很难看 --- 中文没有色彩显示,而英文则是多姿多彩。 文本编辑程序,没有把你的中文彩色显示。我查了查资料。似乎notepad++和sublime text都不能特别为中文的设置颜色; 注释里可能有中文,注释中文和变量、函数中文应该用不同的颜色,这都无法设置。...
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reactjs - Trying to convert html to pdg using htmltocanvas, blank page appears
I'm trying to convert my my page to a pdf. I have followed this post in order to do so: https://medium.com/@shivekkhurana/how-to-create-pdfs-from-react-components- ... </Container> <Button onClick={() => this.toPDF()}>Bla</Button> </div>...
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在vue中用axios进行文件上传,浏览器占用的内存不断增大且不会降下去。这是什么问题?
无论是谷歌还是火狐浏览器,运行一段事件后占据的内存都比较大,这种怎么处理呢?...
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Jan 29, 2021
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Blazor HTTPRequestMessage with several named parameters
Using the most recent version of VS 2019 Community with SDK 5.0.101 I have created an Editform and I can see on the button submit action that all the ... call a site with parameters so that I could proceed I'd very much appreciate....
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amazon ec2 - Updating kubernetes with kOps causes calico-node to fail with "BIRD is not ready: BGP not established"
Let me preface this by saying this is running on a production cluster, so any 'destructive' solution that will cause downtime will not be an option (unless absolutely ... ) Path: /opt/cni/bin HostPathType: cni-net-dir: Type: HostPath (ba...
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swift - SwiftUI transition(.asymmetric..) not working with Offset
I am working on a Set Game and I want the cards to swing on the view (from off the screen) via the .transition(.asymmetric(insertion: .offset(x: 100.0 ... want to see the full source code, you can check out the repository: Link SetGame Repo...
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powerbi - Power BI can't connect to MySQL DB
I have created a database in MySQL called 'Sales Data' at server 127.0.0.1. I log into this database on MySQL workbench as user root with my password, ... installed all the necessary connectors, etc. Any idea why it can't find my database?...
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Jan 27, 2021
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android - Crashlytics don't report crashes in firebase
Application using Dexguard(8.4.9), Crashlytics(17.2.2), CrashlyticsGradle(2.3.0) Already insert a lot of rules in dexguard-rules and not ... ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641) at java.lang.Thread.run(Thread.java:919)...
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305
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python - JsonPickle Objects with same Identity
I am currently wondering if the following is a gug or intended behaviour. I try to serialize a Python object tree, where some objects are the same. I want ... nasty when you miss to register a class (pointers are resolved to wrong objects)....
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Jan 27, 2021
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python
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290
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sql - How to cast array elements within UNNEST statement
I have a REPEATED column of type ARRAY[STRING] in BigQuery, and I want to create a filter on it that does this : SELECT campaign, event_list FROM ` ... a clause like this WHERE 1 IN UNNEST(integer_event_list). How do I achieve this?...
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Jan 27, 2021
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sql
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多个标签排列如何避免重叠?
如图所示,页面里需要排版很多标签,但是很多标签重叠在一起,看起来很混乱(图A) 现在想让标签的分布变成图B的样子,可以旋转一定角度并且不出现重叠; 或者干脆忽略一部分标签不显示(图C),请问要达到图B或图C的效果,应该怎么计算标签的位置和旋转角度来排列它们,又怎么计算哪一个标签应该被忽略不显示呢? 问题补充: 重叠的定义 经过避免重叠处理后的结果...
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Jan 27, 2021
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192
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sql - select distinct and autoincrement field in select query
I have a table Product with ProductNo ProductDetail UniqueiD(Primarykey) L1234 ProductA 1 L1234 ProductB 2 L1234 ProductC 3 M1234 ProductD 4 M1234 ProductE 5 So i need ... . say Name code L1234 1 M1234 2 How do i achieve this? Thanks...
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c# - Blazor CascadingParameter vs singleton DependencyInjection
I have recently learned that you can provide cascadingValues to the entire project by wrapping the Router component in the provider Microsoft doc. How is this ... mean performance and architecture wise) Which do you think is better to use?...
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Jan 27, 2021
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539
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react在使用antd-mobile里面的复选框组件时,重复快速点击复选框会出来这个问题
import React, { Component } from 'react'; import home_banner from './img/home_banner.png'; import home_map from './img/home_map.png'; import img_1 from './img/1. ... connect(state => ({ homeData: state.homeData, }), { saveAddr })(Home)...
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Jan 27, 2021
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为什么axios封装后出现跨域呢?
原生的axios跨域问题后端加了header解决,今天把axios进行了二次封装,测试时发现又出现了跨域问题,这是怎么回事呢?...
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Jan 27, 2021
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votes
191
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mysql 索引问题
MySQL5.7 我的表 比较简单 只有 id,a,b 三个字段 (id是自增主键) 一开始 表中只有一个索引 a, 发现如下语句走a索引 explain select a,b from t1 where a=998 and b = 13; 后来新增了个 (a,b)联合索引, 结果发现还是走 a 索引, 不走联合索引 后来删除了 索 ... 盖索引 之后又加上 索引a, 发现走的还是 (a,b)联合索引 那为什么一开始一直走索引a呢? 感觉好像缓存了什么似的..... 好奇怪...
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Jan 27, 2021
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mysql
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263
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python - How can I determine library version in Google Collab to determine app's requirements.txt?
I am using the time library in Python (e.g. time.sleep(initial_delay)) via Google Collab for an ETL I'm making and want to specify it as a requirement for a web ... Python? I just need its version e.g. pandas==1.1.5 for my requirements.txt....
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Jan 27, 2021
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python
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甲方提要求要title换行显示,求解决方法
是react,antd组件的table中的title...
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Jan 27, 2021
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iview 中 Render 函数 渲染 Button 如何处理 ghost?
iview 中 Render 函数 渲染 Button 如何处理 ghost? 原先版本: props:{ type:"ghost" } 新版本报错:该如何写 ghost?...
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iview
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python - Django Error - MultiValueDictKeyError at /new_bid/5 'total_bid.' (Beginner help appreciated)
I'm creating a page on a site to allow users to 'bid' on items similar to ebay. When I try to enter a number (dollar amount) on the item on the site (to ... , }) else: return render(request, "auctions/listing.html", { "id": listingid, })...
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Jan 27, 2021
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python
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web nodeJS应用,docker怎样获取客户端真实IP
1. 问题描述 Web服务用node的express框架跑的,采用docker部署方式。 docker容器内node服务,请求头req.header里面的请求ip为docker服务宿主机(即docker服务部署机器的ip),而不是浏览器客户端真实ip。 如何在web服务的docker容器内,获取客户端实际ip呢,谢谢!...
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120
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一个列表子项序号的更新问题
有一个列表,子项显示序号,可以设置某一子项不显示序号,该子项后面的序号便会更新,有一些子项是默认不显示序号。可以在任意位置插入子项,删除子项,可以相互拖动调换位置。如图显示看的清晰...
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etl - linq2db - server side bulkcopy
I'm trying to do a "database side" bulk copy (i.e. SELECT INTO/INSERT INTO) using linq2db. However, my code is trying to bring the dataset over the wire ... just act like a C# to SQL transpiler but it is also trying to move data around....
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javascript - React native navigation not displaying stack screen
I'm using React Native Navigation dependency as route. But I have problem in the following code which appears to do nothing. I'm trying to create 2 ... didn't work either. How can I display React Native Navigation stack screen correctly?...
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Jan 27, 2021
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