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r - Create a data.frame with m columns and 2 rows

I would like to create a data.frame in R with m (a variable) number of columns (for example 30), and 2 rows ... com/questions/6103764/create-a-data-frame-with-m-columns-and-2-rows...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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haskell - Can I get `cabal install` to use multiple cores?

Does anyone know how to get cabal install to exploit parallelism? I'm compiling with GHC, and while I don't ... /questions/7238147/can-i-get-cabal-install-to-use-multiple-cores...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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bootstrap 4 - Uncaught TypeError: Cannot convert object to primitive value(zone-evergreen.js:171)

In Angular 9 (using Bootstrap 4 and Jquery 3.5.1). when clicking on bootstrap collapse button, I ... /uncaught-typeerror-cannot-convert-object-to-primitive-valuezone-evergreen-js1...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - Symfony2 Form Builder - Remove label, make it placeholder

I am playing with Symfony's form builder, and I can't find a way to not display a label. Further, ... .com/questions/16993684/symfony2-form-builder-remove-label-make-it-placeholder...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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windows runtime - Converting HTML entities to Unicode Characters in C#

I found similar questions and answers for Python and Javascript, but not for C# or any other WinRT compatible ... 13492497/converting-html-entities-to-unicode-characters-in-c-sharp...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - How to show an Activity as pop-up on other Activity?

I have an Activity A, and there is a button B in the view. If somebody presses B then I want a pop-up ... questions/3351553/how-to-show-an-activity-as-pop-up-on-other-activity...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How should I give images rounded corners in Android?

I would like to change an image I loaded to have round corners. Any hints, tutorials, best practices you ... questions/1705239/how-should-i-give-images-rounded-corners-in-android...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Why does a C/C++ compiler need know the size of an array at compile time?

I know C standards preceding C99 (as well as C++) says that the size of an array on stack must be known at compile ... -c-c-compiler-need-know-the-size-of-an-array-at-compile-time...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - WebView textarea doesn't pop up the keyboard

When I display a WebView, I don't see the soft keyboard popping up. The hard keyboard also doesn't ... .com/questions/3460915/webview-textarea-doesnt-pop-up-the-keyboard...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - How to get indexpath in prepareForSegue

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if ([segue.identifier isEqualToString:@" ... .com/questions/26278730/how-to-get-indexpath-in-prepareforsegue...

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Android Studio does not install latest application on device

I'm following some tutorials about building apps in Android Studio, but for some reason it's not launching ... 32684530/android-studio-does-not-install-latest-application-on-device...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Get Average Using LINQ

Hoping someone can help me with the LINQ syntax to calculate an average. For example, I have the following ... :https://stackoverflow.com/questions/4590704/get-average-using-linq...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Problem with virtualenv in Mac OS X

I've installed virtualenv via pip and get this error after creating a new environment: selenium:~ auser$ virtualenv ... .com/questions/5904319/problem-with-virtualenv-in-mac-os-x...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - How to create a HTML Cancel button that redirects to a URL

I am playing with the Buttons in the w3schools Tryit editor, and I am trying to figure out how to make my browser ... /how-to-create-a-html-cancel-button-that-redirects-to-a-url...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - regular expression for finding 'href' value of a <a> link

I need a regex pattern for finding web page links in HTML. I first use @"(<a.*?>.*?</a>)" to ... .com/questions/15926142/regular-expression-for-finding-href-value-of-a-a-link...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Remove the first word in a Python string?

What's the quickest/cleanest way to remove the first word of a string? I know I can use split and then ... .com/questions/12883376/remove-the-first-word-in-a-python-string...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Preemptive Basic Auth with HttpUrlConnection?

What is the best way to use preemptive basic http authentication using HttpUrlConnection. (Assume for now ... .com/questions/7019997/preemptive-basic-auth-with-httpurlconnection...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - jQuery keypress left/right navigation

(This question already has answers here): question from:https://stackoverflow.com/questions/4104158/jquery-keypress-left-right-navigation...

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macos - Macros for GCC/G++ to differentiate Linux and Mac OSX?

Macros for GCC/G++ to differentiate Linux and Mac OSX? question from:https://stackoverflow.com/questions/2565979/macros-for-gcc-g-to-differentiate-linux-and-mac-osx...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ruby - Adding foreign key to a rails model

I'm quite new to rails and have been trying to work this out all night with no luck. I have created 3 ... //stackoverflow.com/questions/16257116/adding-foreign-key-to-a-rails-model...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Probability in Java

I was curious to know, how do I implement probability in Java? For example, if the chances of a ... question from:https://stackoverflow.com/questions/8183840/probability-in-java...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Pass C# ASP.NET array to Javascript array

Does anyone know how to pass a C# ASP.NET array to a JavaScript array? Sample code will also be nice. Sorry ... com/questions/3464498/pass-c-sharp-asp-net-array-to-javascript-array...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Can't Load URL: The domain of this URL isn't included in the app's domains - Facebook Login

I'm trying to get access token from user string response_script = "<script>top.location.href='https://www.facebook.com ... -domain-of-this-url-isnt-included-in-the-apps-domains-fac...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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google maps - How to change the position of marker from a javascript function?

I have to change the position of a marker on Google map from a javascript function. How can I achieve that? ... /how-to-change-the-position-of-marker-from-a-javascript-function...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iphone - Asihttprequest 61 errors

I'm using the ASIhttprequest in many projects but recently with each new project when I'm ... reachabilityWithHostName:] in Reachability.o "_SCNetworkReachabilitySetCallback", re...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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flutter - how to change dart line length in vscode when formatting dart files?

i'm using VS Code for flutter development and one issue i have is code formatting (styling) which is not as ... -to-change-dart-line-length-in-vscode-when-formatting-dart-files...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - Background Selector in RecyclerView Item

I'm using the RecyclerView like below: <android.support.v7.widget.RecyclerView android:id="@+id/ ... /stackoverflow.com/questions/25392722/background-selector-in-recyclerview-item...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - XCTest and asynchronous testing in Xcode 6

So Apple said in the release note of Xcode 6 that we can now do asynchronous testing directly with XCTest. ... .com/questions/24704338/xctest-and-asynchronous-testing-in-xcode-6...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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