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dplyr - How to Subtract two values from last column and bring to next in R?

I have this table How can I roll over this Quantity based on previous row's calculations? Please help me out here. ... on projection in every row and add Upcoming Qty. Sample File...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql远程数据库如何提高查询效率？

执行了相同的47条sql查询语句，连接本地数据库执行时用时167毫秒，连接远程数据库执行用时2秒，正常吗？如何才能提高查询效率？远程数据库所在服务器带宽1M 查询总数据量大概30k 数据库服务器ping值正常，40~60ms 数据库配置加入skip-name-resolve无效...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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scala - DriverManager.getConnection method is failing establish jdbc connection with apache phoenix

Getting below error, while writing data to Hbase through apache phoenix using spark scala code. All the Htrace ... queue users.admin --conf spark.speculation=true example.jar...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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发布订阅模式，当订阅者太多时，如何优化

发布订阅模式当订阅者太多时，怎么优化？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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457 views

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使用axios下载blob文件，文件过大时超时

下载大文件时只有开发者工具这里有显示，浏览器没有显示下载进度（用的谷歌浏览器），如果下载时间过长的话超时了就不会继续下载了，这种情况怎么解决呢？前端解决还是后端解决？怎么可以显示下载进度啊。...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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求推荐一个移动端上的后台管理端框架 vue用的

求推荐一个移动端上的后台管理端框架 vue用的...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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vue-router在hash模式下打包部署后通过url访问报404

vue router是hash模式的- 项目打包上线后想实现直接在地址栏第一次输入 /dist/#/guard 会报404 但第二次刷新或者在地址栏再复制路径就能访问到...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How do I reset a value in a database every day in firebase database?

Let's say I have a value at "/nullable/uid/" and it has this line: daily_rep: 10 and so, how to make this ... do you need to do for this? for example, use Firebase Functions?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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how to get values from table cell dynamically in javascript

This is my code and i am trying to get values by onclick form a table cells dynamically. let Table = document. ... console.log i am getting only the first value of table cell...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - Part of the window dialog(showDatePicker) that falls on top of the pdf(EasyWebView) does not work, not react

I use two plugins: EasyWebView and showDatePicker. In EasyWebView i show pdf via the link. Under certain conditions, I need ... ) ? No issues found! How this can be solved?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Using updateMany() in updating multiple documents

I have trouble in updating all my documents in MongoDB. Update is the easiest I could do but I still wanted options on how to ... "ian.tayao.gov.ph", "phone": "+4 1234567"}}})...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Js 正则校验

长度限制512个字符，可以填写字母、数字和英文符号...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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自适应网页手机模拟访问和最终效果不一样，是什么原因？

http://html.kodesolution.live/html/2019/business/industriy/p2-2233-industriy/demo/index-mp-layout1.html 这个网页，在Chrome浏览器里面模拟手机访问，图片尺寸是正常的实际上在手机浏览器里面访问时，图片高度拉长了是哪里出错了？应该怎么排查，谢谢！...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - ICS file showing dangerous script

I am trying to generate the .ics file through PHP. But after download, the file google chrome showing the dangerous file. ... attachment; filename='.time().'.ics'); echo $ical;...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What is the different between adding to images together using "+" and the add() method in Opencv in Python?

So imagine we have two images: img1 and img2. when adding these two together using + or cv2.add() we get different results. ... ? img = img1 + img2 img = cv2.add(img1, img2)...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Why is ZLib not appending the adler32 and length fields to compressed data?

I've got a problem with my usage of the ZLib API. My data is correctly compressed and decompressed again, but the : ... ->stream.avail_out == 0); assert(result == Z_STREAM_END);...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Pandas pivot_table aggfunc ignores categories if more than one line of data is being aggregated

I am trying to aggregate a dataframe using pandas.pivot_table and find it behaves differently when multiple lines are aggregated ... I hope that is clear, first question! Thank you...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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centos在没有网络的内网服务器如何部署内部yum，以及rpm如何更新？

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asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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请教：Java怎么建立一个类似于SQL的数据结构？

请教：需要写一个Java数据存储和查找模块，内嵌在一大段Java项目里不需要像JTable那样展示表格，但是需要建立一个类似于SQL的数据结构，用于搜索满足一定条件的球员姓名 | 姓名 | 性别 | ... "男",170,170,"突击"} }; Map<String, Map(List<String>, List<String>)> ` 谢谢了先！...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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node.js socket continous data stream

I have a node.js based server running on Raspberry that performs as relay between TCP clients and USB devices. Here what ... Is there a way to stream data intelligently ? Thanks M...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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CI框架集成phpCAS，session冲突

CI自带的session是采用的配置文件中自动加载，然后phpCAS中也用到了session？将CI框架中的session取消加载，CAS就可以用了，然后项目中的session就用不了了，僵局怎么破？### 问题描述...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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k8s servcie account 安全性疑问

有个问题一直没想明白 service account是用于pod组件想去调用api server而设计的对吧，通过在pod yaml的serviceAccountName填写一个定义好的service account资源名称指定，那么pod就具有 ... account名称变成了保证安全性的东西了，泄漏service account名称就等于账号泄漏了？...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Naive Bayes function in R

I'm trying to apply Naive Bayes algorithm to my data set but somehow the final comprovation is not working. What am I ... 10 2 3 6006 11093 18881 1159 7425 2098 Thanks in advance...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Twilio - com.twilio.rest.api.v2010.account.Message

I would like to track response received from twilio for a sms without acutally using some alternative like creating rest ... in xml format . Any java samples will be helpful....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Mutually disjoint sets

I thought I found a solution to the k mutually disjoint sets problem, which is NPC. What is the problem with my solution? Edit As ... a in A: if a in B: res.append(a) return res...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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313 views

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java - Get Microsoft document author

I have to go thru about 200 gigs worth of files to find files created/owned by specific users. For most files I can ... a Microsoft file with Java? Or is it even possible at all?...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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288 views

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阿里的一个面试题，考察linux下的条件变量的用法，pthread_cond_wait（）

参加了阿里的一个面试，面试官从正常代码里删除了几行，要求我找出下面这段代码的错误我看了半天也没找到问题其中worker()函数是7个线程的执行函数各位爸爸,谁知道下面这段代码错在 ... ) { /* Create threads pool */ cnt=1000; while(cnt--){ workers_go(1); sleep(10); } }...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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利用python word转html 能显示数学公式吗？

利用python word转html ,数学公式能正常显示吗？。。phps试过公式无法正常显示...

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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