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linux - What does $@ mean in a shell script?

What does a dollar sign followed by an at-sign (@) mean in a shell script? For example: umbrella_corp_options $@ Question&Answers:os...

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

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196 views

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html - html5 - canvas element - Multiple layers

Without any extension library, is it possible to have multiple layers in the same canvas element? So if I do a ... it will not erase the bottom one? Thanks. Question&Answers:os...

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

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339 views

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python - Pandas DataFrame Groupby two columns and get counts

I have a pandas dataframe in the following format: df = pd.DataFrame([[1.1, 1.1, 1.1, 2.6, 2.5, 3.4 ... And I want to find largest count for each 'col2' value? Question&Answers:os...

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

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Entity Framework and SQL Server View

For several reasons that I don't have the liberty to talk about, we are defining a view on our Sql Server 2005 ... any field of this view as a primary key? Question&Answers:os...

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

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python - How can I make a scatter plot colored by density in matplotlib?

I'd like to make a scatter plot where each point is colored by the spatial density of nearby ... accomplish something similar in python using matplotlib? Question&Answers:os...

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

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140 views

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c# - How to update record using Entity Framework 6?

I am trying to update a record using EF6. First finding the record, if it exists, update. ... since entities were loaded. Refresh ObjectStateManager entries Question&Answers:os...

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

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c# - What is the difference between Task.Run() and Task.Factory.StartNew()

I have Method : private static void Method() { Console.WriteLine("Method() started"); for (var i = 0; i ... . When we should use first variant and when second? Question&Answers:os...

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

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javascript - Relation between CommonJS, AMD and RequireJS?

I'm still very confused about CommonJS, AMD and RequireJS, even after reading a lot. I know that CommonJS (formerly ... definition? If yes, what's AMD then? Question&Answers:os...

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

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A definitive guide to API-breaking changes in .NET

I would like to gather as much information as possible regarding API versioning in .NET/CLR, and specifically how ... methods to be called as static methods. Question&Answers:os...

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

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ios - How can I mimic the bottom sheet from the Maps app?

Can anyone tell me how I can mimic the bottom sheet in the new Apple Maps app in iOS 10? In Android, you can ... . This is what I mean by "bottom sheet": Question&Answers:os...

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

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git subtree - Merge two Git repositories without breaking file history

I need to merge two Git repositories into a brand new, third repository. I've found many descriptions ... repositories and leave individual file history intact? Question&Answers:os...

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

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javascript - Send message to specific client with socket.io and node.js

I'm working with socket.io and node.js and until now it seems pretty good, but I don't know how to send a ... I feel there must be a better solution. Any ideas? Question&Answers:os...

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

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350 views

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Keep file in a Git repo, but don't track changes

I have several files in a CodeIgniter site that I will want to have in the repo but not track any changes on ... pull. All of my changes are then overwritten. Question&Answers:os...

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

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multithreading - Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)

POSIX allows mutexes to be recursive. That means the same thread can lock the same mutex twice and won't ... and the difference is really not that big. Question&Answers:os...

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

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php - What are namespaces?

What are PHP Namespaces? What are Namespaces in general? A Layman answer with an example would be great. Question&Answers:os...

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

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348 views

1 answer

python - Get the key corresponding to the minimum value within a dictionary

If I have a Python dictionary, how do I get the key to the entry which contains the minimum value? I was thinking about ... , 321:0, 322:3} It would return 321. Question&Answers:os...

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

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264 views

1 answer

c# - How do I remove all non alphanumeric characters from a string except dash?

How do I remove all non alphanumeric characters from a string except dash and space characters? Question&Answers:os...

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

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89 views

1 answer

Ruby on Rails - Import Data from a CSV file

I would like to import data from a CSV file into an existing database table. I do not want to save the CSV file, ... to show me the best way to do this, thanks. Question&Answers:os...

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

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164 views

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sql - Best way to work with dates in Android SQLite

Closed. This question is opinion-based. It is not currently accepting answers. Question&Answers:os...

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

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327 views

1 answer

Add new attribute (element) to JSON object using JavaScript

How do I add new attribute (element) to JSON object using JavaScript? Question&Answers:os...

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

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252 views

1 answer

linux - How to use regex with find command?

I have some images named with generated uuid1 string. For example 81397018-b84a-11e0-9d2a-001b77dc0bed.jpg. I want ... regex? Could someone help me with this? Question&Answers:os...

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

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306 views

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javascript - How to efficiently randomly select array item without repeats?

I'm aware that this question is around in many guises but I have not been able to find an answer relating to my specific ... == 13) { chooseName(); } }, false); Question&Answers:os...

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

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189 views

1 answer

java - How to parse json parsing Using GSON in android

I am using GSON for parse Json data. My Json data is below: { "count": "12", "colbreak": 1, "name" ... : Expected BEGIN_OBJECT but was NAME at line 1 column 73 Question&Answers:os...

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

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1.2k views

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bit shift - What does the C standard say about bitshifting more bits than the width of type?

Consider the following code: int i = 3 << 65; I would expect that the result is i==0, however the ... width of type int) or is this unspecified behavior? Question&Answers:os...

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

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350 views

1 answer

scheme - Unexpected persistence of data

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

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333 views

1 answer

swing - Java - Transparent JScrollPane

I have a JTextArea and it's riding ontop of a JScrollPane. Anyways, I know I can use the getViewPort() method to set ... ); } else { sp.setVisible(true); } } Question&Answers:os...

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

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1.1k views

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automated tests - Karate: Is there a http-request hook in karate, that gets called automatically after every API call, and whose behaviour I can modify?

This question already has answers here: Question&Answers:os...

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

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153 views

1 answer

java - Inconsistent performance applying ForegroundActions in a JEditorPane when reading HTML

I'm building an HTML editor using JEditorPane, but I'm getting some inconsistent performance issues with Foreground Actions. ... } catch (IOException ex){} } } Question&Answers:os...

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

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