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r - Fastest way to replace NAs in a large data.table

I have a large data.table, with many missing values scattered throughout its ~200k rows and 200 columns. I would like ... to a data.table won't take too long. Question&Answers:os...

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

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255 views

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What is the equivalent of ngShow and ngHide in Angular 2+?

I have a number of elements that I want to be visible under certain conditions. In AngularJS I would write <div ng-show ... > How can I do this in Angular 2+? Question&Answers:os...

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

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567 views

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TypeScript: Object.keys return string[]

When using Object.keys(obj), the return value is a string[], whereas I want a (keyof obj)[]. const ... check all checkboxes in Options to activate strict: true. Question&Answers:os...

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

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get - Servlet and path parameters like /xyz/{value}/test, how to map in web.xml?

Does servlet support urls as follows: /xyz/{value}/test where value could be replaced by text or number. How to map that in the web.xml? Question&Answers: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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.net - Automatically decompress gzip response via WebClient.DownloadData

I wish to automatically uncompress GZiped response. I am using the following snippet: mywebclient.Headers[ ... use instead of mywebclient.DownloadData ? Question&Answers:os...

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

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201 views

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Jsoup Java HTML parser : Executing Javascript events

Can I fill out forms, execute events and Javascript functions in Jsoup? If yes how can I? Or should I go for another parser. Question&Answers:os...

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

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138 views

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php - How to hide config files from direct access?

I am using Laravel for web app. Uploaded everything on production and found out that some of the files can ... /composer.json How to avoid that direct access? Question&Answers:os...

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

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Why does a space in a variable assignment give an error in Bash?

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

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git log - View the change history of a file using Git versioning

How can I view the change history of an individual file in Git, complete details with what has changed? I have ... to be a simple right-click → Show history. Question&Answers:os...

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

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149 views

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How to retrieve a single file from a specific revision in Git?

I have a Git repository and I'd like to see how some files looked a few months ago. I found the revision ... Basically, I'm looking for something like svn cat. Question&Answers:os...

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

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202 views

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Difference between DataFrame, Dataset, and RDD in Spark

I'm just wondering what is the difference between an RDD and DataFrame (Spark 2.0.0 DataFrame is a mere type ... Spark? Can you convert one to the other? Question&Answers:os...

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

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365 views

1 answer

javascript - Show or hide element in React

I am messing around with React.js for the first time and cannot find a way to show or hide something on ... React.renderComponent(<Search /> , document.body); Question&Answers:os...

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

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213 views

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Five equal columns in twitter bootstrap

I want to have 5 equal columns on a page I am building and I can't seem to understand how the ... demonstrated above part of the twitter bootstrap framework? Question&Answers:os...

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

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214 views

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c# - Path.Combine for URLs?

Path.Combine is handy, but is there a similar function in the .NET framework for URLs? I'm looking for syntax ... return: "http://MyUrl.com/Images/Image.jpg" Question&Answers:os...

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

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561 views

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css - How to deal with page breaks when printing a large HTML table

I have a project which requires printing an HTML table with many rows. My problem is the way the table is ... whole change I thought I could ask here before. Question&Answers:os...

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

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736 views

1 answer

c# - Could not establish trust relationship for SSL/TLS secure channel -- SOAP

I have a simple web service call, generated by a .NET (C#) 2.0 windows app, via the web service proxy generated ... do I set up trust relationships? I'm lost! Question&Answers:os...

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

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233 views

1 answer

php - How to embed images in email

I need to embed an image in e-mail. How do I do it? I do not want to use third party tool, nor am ... I am merely interested in format of resulting e-mail body. Question&Answers:os...

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

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243 views

1 answer

Unicode character in PHP string

This question looks embarrassingly simple, but I haven't been able to find an answer. What is the PHP ... character whose "Unicode numeric value" is known? Question&Answers:os...

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

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225 views

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Are negative array indexes allowed in C?

I was just reading some code and found that the person was using arr[-2] to access the 2nd element before the arr, ... - 2), which seems OK. What do you think? Question&Answers:os...

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

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311 views

1 answer

c - What's the use of do while(0) when we define a macro?

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

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152 views

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c - Assigning strings to arrays of characters

I am a little surprised by the following. Example 1: char s[100] = "abcd"; // declare and initialize - ... )? Could someone explain me the logic behind this? Question&Answers:os...

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

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497 views

1 answer

Javascript objects: get parent

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

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658 views

1 answer

javascript - Force browser to download image files on click

I need the browser to download the image files just as it does while clicking on an Excel sheet. Is there ... of downloading an Excel sheet (what browsers do)? Question&Answers:os...

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

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397 views

1 answer

math - Why is division in Ruby returning an integer instead of decimal value?

For example: 9 / 5 #=> 1 but I expected 1.8. How can I get the correct decimal (non-integer) result? Why is it returning 1 at all? Question&Answers:os...

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

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195 views

1 answer

python - x, = ... - is this trailing comma the comma operator?

I don't understand what does comma after variable lines, means: http://matplotlib.org/examples/animation/ ... related to tuples containing only one item. Question&Answers:os...

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

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433 views

1 answer

python - Convert number strings with commas in pandas DataFrame to float

I have a DataFrame that contains numbers as strings with commas for the thousands marker. I need to convert ... DataFrame of strings to a DataFrame of floats? Question&Answers:os...

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

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404 views

1 answer

tsql - Convert multiple rows into one with comma as separator

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

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325 views

1 answer

javascript - Identifying Between Refresh And Close Browser Actions

When we refresh the page (F5, or icon in browser), it will first trigger ONUNLOAD event. When we close the ... browser. If you have any solution then give me. Question&Answers:os...

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

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