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Recoding variables in R, seems to be my biggest headache. What functions, packages, processes do you use to ... be a community wiki topic. See Question&Answers more detail:os...

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

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PHP exec() as Background Process (Windows Wampserver Environment)

I'm trying to setup a php trigger file that will set off a background process. (see this question) I'm ... /backgroundProcess.php", 0, false); 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 - C++ Boost: undefined reference to boost::system::generic_category()

I am trying to include Boost libraries in my project and have been facing issues in the same. I am on Ubuntu ... seconds) 6 errors, 0 warnings 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 - TypeError: list indices must be integers or slices, not str

I've got two lists that I want to merge into a single array and finally put it in a csv file. I'm a newbie ... not str How can my count work ? See Question&Answers more detail:os...

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

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When is casting between pointer types not undefined behavior in C?

As a newcomer to C, I'm confused about when casting a pointer is actually OK. As I understand, you ... , changing the number of parameters See Question&Answers more detail:os...

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

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asp.net mvc - Razor View throwing "The name 'model' does not exist in the current context"

After significant refactoring in my MVC 4 application, and Razor shows this error while debugging Views: The name 'model' ... How can I fix 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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How can I pass command-line arguments to a Perl program?

I'm working on a Perl script. How can I pass command line parameters to it? Example: script.pl "string1" "string2" 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 - Save child objects automatically using JPA Hibernate

I have a one-to-many relation between Parent and Child table. In the parent object I have a List<Child> ... children objects? 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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How does the leading dollar sign affect single quotes in Bash?

I need to pass a string to a program as its argument from the Bash CLI, e.g program "don't do this" The string ... I can't find what I need... See Question&Answers more detail:os...

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

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.net - How do I create an expression tree to represent 'String.Contains("term")' in C#?

I am just getting started with expression trees so I hope this makes sense. I am trying to create an ... Contains() method. Help appreciated. See Question&Answers more detail:os...

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

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Create file with given size in Java

Is there an efficient way to create a file with a given size in Java? In C it can be done with ... ftruncate and also of Sparse files 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 - ERROR: Loading local data is disabled - this must be enabled on both the client and server sides

I don't understand the responses that others have provided to similar questions except for the most obvious ones, ... the command line shell. 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# - How do I add a custom routed command in WPF?

I have an application that contains Menu and sub menus. I have attached Appliocation Commands to some of the sub menu ... to my sub menu items. See Question&Answers more detail:os...

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

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php - Increment value in MySQL update query

I have made this code for giving out +1 point, but it doesn't work properly. mysql_query(" UPDATE member_profile ... . What have I done wrong? See Question&Answers more detail:os...

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

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How to return an array in bash without using globals?

I have a function that creates an array and I want to return the array to the caller: create_array() ... my_list without using anything global? See Question&Answers more detail:os...

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

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syntax - What do curly braces in Java mean by themselves?

I have some Java code that uses curly braces in two ways // Curly braces attached to an 'if' statement: ... after the first if statement mean? 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 - Can i cycle through line styles in matplotlib

I know how to cycle through a list of colors in matplotlib. But is it possible to do something similar with ... Any suggestions how to do that? 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++ - What are the advantages of boost::noncopyable

To prevent copying a class, you can very easily declare a private copy constructor / assignment operators. But you ... using boost in this case? See Question&Answers more detail:os...

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

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777 views

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animation - CSS Auto hide elements after 5 seconds

Is it possible to hide element 5 seconds after the page load? I know there is a jQuery solution. I want ... limit of css transition/animation? 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 - python tracing a segmentation fault

I'm developing C extensions from python and I obtain some segfaults (inevitable during the development...). I'm ... how can I do that? 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++11 - How to create timer events using C++ 11?

How to create timer events using C++ 11? I need something like: “Call me after 1 second from now”. Is there any library? 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 Image Url Verify

I need to verify an image url to check whether the url is an image of any of these extensions:- jpeg, jpg, gif, ... the url is an image or not. See Question&Answers more detail:os...

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

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apache - Running two PHP versions on the same server

I have two projects on the local server, one project is running PHP5.6 and the other one is running PHP7.0 ... is the screenshot of the phpinfo. 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# - Implementing Audit Log / Change History with MVC & Entity Framework

I am building in a Change History / Audit Log to my MVC app which is using the Entity Framework. So ... base.SaveChanges(options); } } See Question&Answers more detail:os...

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

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html - Python check if website exists

I wanted to check if a certain website exists, this is what I'm doing: user_agent = 'Mozilla/20.0.1 (compatible ... page I'm reading does exit? See Question&Answers more detail:os...

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

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.net - Where do I get a thread-safe CollectionView?

When updating a collection of business objects on a background thread I get this error message: This type of ... make my objects use 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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327 views

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python - pip install gives error: Unable to find vcvarsall.bat

Using pip install zipline on Windows 8 with Python 2.7 gives me the error: Downloading/unpacking six (from python- ... gives the same error... See Question&Answers more detail:os...

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

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iphone - How to check programmatically if an App is installed?

I am developing an iPhone application which will install few third party applications in an enterprise. I have ... app is already installed.) See Question&Answers more detail:os...

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

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