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414 views

1 answer

python - How to implement a transition matrix as a numpy array and generate a Markov chain from it?

I want to use python to generate a realisation of the Markov chain using the transition matrix given as import numpy ... can I generate a Markov chain from this transition matrix?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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200 views

1 answer

azure - Store secrets in DeviceTwin

A bit of a conceptual question, We are looking at implementing devicetwins in our IoT hub solution, it's clear for us ... is this a wrong assumption and am I worrying to much?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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121 views

1 answer

java - QueryDSL filtering with a label table

I have a table which is queried for a grid view using labels as filters. Schema: project: id, col_a label: ... ().and(subExpression).getValue() : expression.and(subExpression); }...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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588 views

1 answer

vue 使用作用域插槽的一个问题

我在使用作用域插槽向父组件暴露数据的同时可以使用具名插槽吗？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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473 views

1 answer

php - unsupported option when trying to build docker compose on a Laravel project

I am following this tutorial to install and set up Laravel with Docker-Compose. I want to build an ... docker-init: Version: 0.19.0 GitCommit: de40ad0...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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236 views

1 answer

excel - Copy multiple sheets to one master sheet with today function

I am in need of a VBA code that: can copy four different worksheets (with data from four different dates, which are every ... to this I am grateful for any help or tips on this!...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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400 views

1 answer

关于select epoll底层原理问题

select 如上图所说select poll是轮训方式来查看所有监听的socket,这里的意思是说调用了select poll后就死循环轮训所有要监听的socket集吗，那这样的话不是很蠢效率很低吗？这里epoll是说是用回调方式来检测就绪事件，意思是说epoll调用以后进程阻塞也也不做轮训当某个socket有数据时通知调用epoll的进程唤醒吗？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.4k views

1 answer

pygame - How to make multiple choice games on python

I am making a game which includes multiple choice questions. It will include the user choosing one of the three options to ... how to begin, it'll be very appreciated. Thank you....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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152 views

1 answer

Stale Element after downloading file selenium python

Trying to download videos after clicking a link. It works for the first page, but when the second link ... else: continue driver.close() driver.switch_to.window(parent_window)...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.2k views

1 answer

Why might git describe always return `fatal: No tags can describe SHA1` after I converted a svn repo to a git repo?

I am trying to convert a svn repo to a git repo. I therefore followed the second (most upvoted) answer of a ... the error message? I am grateful for any hints or suggestions!...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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539 views

1 answer

有n个业务员，每天有n个订单，我怎么统计出每个业务员每天有几个订单。数组表格显示。

比如说，这样一个表格，要显示业务员姓名，账号，还有每个业务员的今日订单总数我的订单表是这样的业务员A 9月29 16:09 ~~ 一个订单业务员A 9月29 16:19 ~~ 一个订单业务员A 9月29 16:21 ~~ ... 09 ~~ 一个订单我会统计每个业务员的总量但是我不懂怎么把每个业务员的今日总数跟自己的名字一起拼接回来 ...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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295 views

1 answer

JavaScript: 块作用域是函数作用域的子集?望得到解答.

插图中来自红宝书第四版的一小段:(第26页) (图中分别是中英的版本,我都有认真去看) 如图是正在看红宝书第四版的一小段,这里说: 块作用域是函数作用域的子集 Block scope is strictly a subset of function ... 前面的矛盾了. 因此,我认为应该是作者的笔误了,应该调转过来才对: 函数作用域是块作用域的子集....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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522 views

1 answer

localStorage.setItem覆盖问题

localStorage.getItem("data"); localStorage.setItem("data", "status"); 每次进入页面localStorage的data有个默认值, 但同时通过点击事件也要能更新这个status这个状态我想到的是点击事件在加 ... 刷新的时候就是用户点击的这个新状态,如果没有点击那么就是自动加载一个默认值...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

464 views

1 answer

PostgreSQL select query with where clause 'COLUMN_1 is null' hangs

Recently we restored PostgreSQL database from the backup which was created without stopping database (I know this was very ... column. How can I repair such possibly damaged table?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

213 views

1 answer

google play - What is the problem with my Android app icon?

I'm trying to upload my app onto the Google Play Store platform but it keeps refusing my icon even though I've made sure it meets the requirements...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

666 views

1 answer

c#进程间通信方式的选用问题？已知条件：有窗体的进程向无窗体的进程发送消息，并且是大数据量

SendMessage机制对无窗体的进程行不通。管道可以吗？或者其他更合适的是什么？不考虑Socket，因为只是单机，不想过度设计。...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

368 views

1 answer

为什么在android设备内部存储上看不到有些app的包文件?

一般而言, android 设备在内部存储/Android/data/ 这个路径下, 都有跟应用包名相关的文件夹目录, 为什么同一个设备, 有些app有, 而有些app没有呢?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

493 views

1 answer

Springboot Cannot resolve symbol 'springframework' 哪里出了问题

貌似解决了问题，maven 已经开始导入了. 原因：idea2019与maven3.6版本不兼容问题，解决办法，要么升级idea，要么降级maven 原来用的3.6.2，现在换成了3 ... general responsiveness: ok; EDT responsiveness: ok 2020-10-16 22:06:04,642 [ 11167]...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

991 views

1 answer

e2e testing - Playwright test library - checkbox state

Please, how to get the status a checkbox element in the Playwright E2E test library....

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

729 views

1 answer

node.js - create a video clip from m3u8 file using node js

const ffmpegPath = require('@ffmpeg-installer/ffmpeg').path; const ffmpeg = require('fluent-ffmpeg'); const process = require(' ... way to do that like I'm doing using arguments???...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

701 views

1 answer

Postgresql 日期时间怎么以yyyy/MM/dd HH:mm:ss形式存储

### 问题描述项目需要将时间类型以yyyy/MM/dd HH:mm:ss形式存储,postgresql用的不多,数据库版本用的是96版本的不知道怎么设置...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

841 views

1 answer

lambda - Lamdba expression Python to square even numbers and cube odd numbers

I am using Python 3.8 and I am attempting to write a lambda expression to square even numbers and cube odd numbers. ... However, the lambda expression is not doing the job. Help?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

678 views

1 answer

golang如何判断是从源码运行还是从二进制文件运行?

开发和测试的时候需要加载配置文件，但是由于golang的配置文件用的是相对路径，main.go是在cmd下面的，这和二进制文件获得base dir是不同的，如何判断是go run main.go运行还是./main运行...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

774 views

1 answer

一年数据接近1个亿非结构化数据的场景，用的什么数据库合适？

我们想要全面的记录用户行为，之前买过成熟的统计分析工具（类似百度站长），但想要的很多功能没有，很多不需要的功能倒是挺多的，结果就是成本不低但达不到我们的预期所以考虑自己做套简易的收集系统，搭配本身系统自身能够把数据维度做多一些 ... 写入就不会再更改了非结构化数据量大这些特性出发有没有更合适的简单点的数据库呢莫非必须得走Hbase这些大件才行么？...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.1k views

1 answer

c++ - Visual Studio doesn't break on assert violation

I'm debugging a CMake target in Visual Studio 2019 for a project which is managed by CMake and built using MinGW ... I make Visual Studio break execution when an assertion fails?...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

812 views

1 answer

正则表达式如何写递增数列？

匹配ABC。ABC都是数字，要求ABC是递增的。比如123,456. 谢谢...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

826 views

1 answer

高亮不同项,隐藏相同项,商品详情对比,京东商品对比的那种,有没有人会呢

...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

1.0k views

1 answer

求推荐.net桌面程序单机日志方案

需求：能在代码中写日志（有点废话）在程序目录生成日志文件，最好能加密能自动管理日志文件的分割与清理（按保留日期或大小）带日志查看器，能分类显示，多色呈现，能搜索不排斥商业方案...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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