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I didn't know that C and C++ allow multicharacter literal: not 'c' (of type int in C and char in C++ ... considered to be a bad feature as goto operator or not? Question&Answers:os...

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

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91 views

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How do pointer-to-pointer's work in C? (and when might you use them?)

How do pointers-to-pointers work in C? When might you use them? Question&Answers:os...

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

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123 views

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python - Select rows in pandas MultiIndex DataFrame

What are the most common pandas ways to select/filter rows of a dataframe whose index is a MultiIndex? Slicing ... (these are separate topics for another time). Question&Answers:os...

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

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java - How can I add to List<? extends Number> data structures?

I have a List which is declared like this : List<? extends Number> foo3 = new ArrayList<Integer>(); ... > is not applicable for the arguments (ExtendsNumber) Question&Answers:os...

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

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121 views

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HEAD and ORIG_HEAD in Git

What do these symbols refer to and what do they mean? (I can't find any explanation in official documentation) Question&Answers:os...

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

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php - Sort an Array by keys based on another Array?

Is it possible in PHP to do something like this? How would you go about writing a function? Here is ... seems you can only sort alphabetically or numerically. Question&Answers:os...

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

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sql - How do I query between two dates using MySQL?

The following query: SELECT * FROM `objects` WHERE (date_field BETWEEN '2010-09-29 10:15:55' AND '2010-01-30 ... query to work though. What am I doing wrong? Question&Answers:os...

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

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html - List of HTML5 elements that can be nested inside P element?

I am trying to figure all the valid HTML5 elements that can be nested inside paragraph elements such that w3 validator ... elements, it is good enough for me. Question&Answers:os...

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

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xml - Remove a child with a specific attribute, in SimpleXML for PHP

I have several identical elements with different attributes that I'm accessing with SimpleXML: <data> <seg id="A1"/> <seg id= ... ] == 'A12') { unset($seg); } } Question&Answers:os...

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

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r - How to convert a Shiny app consisting of multiple files into an easily shareable and reproducible Shiny example?

There are resources on how to create a Minimal, Complete, and Verifiable example in general on Stack Overflow, ... shiny app into a good reproducible example? Question&Answers:os...

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

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c++ - Fast bignum square computation

To speed up my bignum divisons I need to speed up operation y = x^2 for bigints which are represented as dynamic arrays ... I found out that my Karatsuba (over/under)flows the LSB...

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

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c# - String representation of an Enum

I have the following enumeration: public enum AuthenticationMethod { FORMS = 1, WINDOWSAUTHENTICATION = 2, SINGLESIGNON ... but that wasn't better either. Question&Answers:os...

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

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python - Difference between numpy.array shape (R, 1) and (R,)

In numpy, some of the operations return in shape (R, 1) but some return (R,). This will make matrix multiplication more ... reshape(R, 1), numpy.ones((1, R))) Question&Answers:os...

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

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How to import CSV file data into a PostgreSQL table?

How can I write a stored procedure that imports data from a CSV file and populates the table? Question&Answers:os...

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

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css - How can I force WebKit to redraw/repaint to propagate style changes?

I have some trivial JavaScript to effect a style change: sel = document.getElementById('my_id'); sel.className = ... nudge WebKit into doing the right thing? Question&Answers:os...

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

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java - What is an initialization block?

We can put code in a constructor or a method or an initialization block. What is the use of initialization ... necessary that every java program must have it? Question&Answers:os...

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

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linux - How to store a command in a variable in a shell script?

I would like to store a command to use at a later period in a variable (not the output of the command, ... pipes/multiple commands) in a variable for later use? Question&Answers:os...

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

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493 views

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xcode4 - "Run > Stop on Objective-C exception" in Xcode 4?

Maybe somebody knows where is the "Run > Stop on Objective-C exception" menu in Xcode 4? I've used it sometimes in Xcode 3, but it disappeared in the new IDE. Question&Answers:os...

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

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selenium - How to open a Chrome Profile through Python

My script I have been writing has been working great. I just added the option so it would open a profile on ... positional argument: 'self' How can I fix this? Question&Answers:os...

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

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angularjs - angular.service vs angular.factory

I have seen both angular.factory() and angular.service() used to declare services; however, I cannot find ... for what (assuming they do different things)? Question&Answers:os...

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

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208 views

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Comparison of Android Web Service and Networking libraries: OKHTTP, Retrofit and Volley

Closed. This question does not meet Stack Overflow guidelines. 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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angular - BehaviorSubject vs Observable?

I'm looking into Angular RxJs patterns and I don't understand the difference between a BehaviorSubject and ... BehaviorSubject over an Observable or vice versa? Question&Answers:os...

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

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112 views

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c++ - When to use references vs. pointers

I understand the syntax and general semantics of pointers versus references, but how should I decide when it is ... is a shame to lose the syntactic clarity. Question&Answers:os...

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

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91 views

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Python Progress Bar

How do I use a progress bar when my script is doing some task that is likely to take time? For example, a ... this can be done from a code point of view. Question&Answers:os...

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

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80 views

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c++ - What are some uses of template template parameters?

I've seen some examples of C++ using template template parameters (that is templates which take templates as ... . What other uses does this technique have? Question&Answers:os...

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

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175 views

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java - Declaring variables inside or outside of a loop

Why does the following work fine? String str; while (condition) { str = calculateStr(); ..... } But ... Is it necessary to declare variables outside the loop? 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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multithreading - Get a list of all threads currently running in Java

Is there any way I can get a list of all running threads in the current JVM (including the threads not started by ... want to be able to do this through code. Question&Answers:os...

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

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240 views

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jsf - When to use valueChangeListener or f:ajax listener?

What's the difference between the following two pieces of code - with regards to listener placement? <h:selectOneMenu ... :selectItems ... /> </h:selectOneMenu> Question&Answers:os...

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

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