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dataset - How to delete the first row of a dataframe in R?

I have a dataset with 11 columns with over a 1000 rows each. The columns were labeled V1, V2, V11, etc.. ... way to delete row 1 and decrement? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Find the index of the k smallest values of a numpy array

In order to find the index of the smallest value, I can use argmin: import numpy as np A = np.array([1, 7, ... values. k will never be > 10. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - When do I use static variables/functions in php?

I am refreshing myself on OOP with PHP and I saw an example of setting functions and/or variables as static. ... just use a variable instead? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ruby on rails - nokogiri gem installation error

I know there are a lot of questions about this gem but no answer has worked for me. When I run in SSH gem ... from extconf.rb:419:in `<main>' See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - AngularJS event on window innerWidth size change

I'm looking for a way to watch changes on window inner width size change. I tried the following and it ... innerWidth); }); any suggestions? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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325 views

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java - Maven: Customize web.xml of web-app project

I have a web application Maven project, and I want to customize the web.xml file depending on the Profile ... one depending on the profile? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - -XX:MaxPermSize with or without -XX:PermSize

We've run into a Java.lang.OutOfMemoryError: PermGen space error and looking at the tomcat JVM params, other than ... Server VM build 16.2-b04 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Launch an IPython shell on exception

Is there a way to launch an IPython shell or prompt when my program runs a line that raises an exception ... prompt with all scopes accessibles. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - But why's the browser DOM still so slow after 10 years of effort?

The web browser DOM has been around since the late '90s, but it remains one of the largest constraints in ... is there such disparity here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Why are batch inserts/updates faster? How do batch updates work?

Why are batch inserts faster? Is it because the connection and setup overhead for inserting a single row is the ... part of the SQL standard? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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254 views

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java - Spring MVC - Binding a Date Field

For request parameters representing string, number, and boolean values, the Spring MVC container can bind them ... request parameter? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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408 views

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hadoop - Easiest way to install Python dependencies on Spark executor nodes?

I understand that you can send individual files as dependencies with Python Spark programs. But what about full ... number of distributed nodes? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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linux - Finding out what characters a given font supports

How do I extract the list of supported Unicode characters from a TrueType or embedded OpenType font on Linux? Is ... .) provided by the font? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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css - Issue when centering vertically with flexbox when heights are unknown

My layout has a container flex-container and a child. HTML: <div class="flex-container"> <div>text</div> </ ... reprehenderit. </div> </div> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - How to unblock with mysqladmin flush hosts

I have gone through similar cases listed here but it doesn't seem to work. I was using MySQL Workbench ... with 'mysqladmin flush-hosts' See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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269 views

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Add github library as dependency to Android-Studio project

I am trying to implement ActionBar-PullToRefresh from https://github.com/chrisbanes/ActionBar-PullToRefresh/wiki/ ... a repository somewhere? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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637 views

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python - Get .wav file length or duration

I'm looking for a way to find out the duration of a audio file (.wav) in python. So far i had a ... but its not consistent. Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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275 views

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Rails 3 SSL routing redirects from https to http

This question relates to this SO question and answer (rails-3-ssl-deprecation ) where its suggested to handle ... happens to https upload_foos? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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246 views

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GDB kind of doesn't work on macOS Sierra

It is a problem that appeared when I first updated to macOS Sierra yesterday. GDB itself is running OK. ... might have some magical solution. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Differences of using "const cv::Mat &", "cv::Mat &", "cv::Mat" or "const cv::Mat" as function parameters?

I've searched thoroughly and have not found a straightforward answer to this. Passing opencv matrices (cv:: ... difference. Thanks guys! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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436 views

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python - Managing Tweepy API Search

Please forgive me if this is a gross repeat of a question previously answered elsewhere, but I am lost on how to ... q=query,rpp=100,count=1000) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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617 views

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xamarin.android - Black screen before Splash screen appear in android

We know that when the app do some long process like downloading some information from internet it could show a ... and avoid form showing this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Django form with choices but also with freetext option?

What I'm looking for: A single widget that gives the user a drop down list of choices but then also ... -down-preferred-but-free-text-allowed See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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210 views

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java - How to slide the ActionBar along with the NavigationDrawer

What I want to do is slide the ActionBar along with the NavigationDrawer when the drawer is opened. I am currently ... want to achieve is this: See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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652 views

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asp.net - Script not served by static file handler on IIS7.5

I've just tried to deploy my first web application to IIS on my Windows 7 Home Premium notebook. After ... enabled IIS after installing VS. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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719 views

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javascript - How to fight tons of unresolved variables warning in WebStorm?

I have a function that takes data from server: function getData(data){ console.log(data.someVar); } WebStorm says ... such field, or rename it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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267 views

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Eclipse: Referencing log4j.dtd in log4j.xml

I've been using log4j for quite a while now and I usually use this at the top of the log4j.xml (probably ... please shed a light on this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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381 views

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javascript - Elegant method to generate array of random dates within two dates

I have a datepicker where I show two months and I want to randomly choose 3 dates in each visible month $('.date ... normal"]; // ordinary day } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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