OStack Q&A-Knowledge Sharing Community

0 votes

183 views

1 answer

Regarding the bounty Ben Bolker's paste2-solution produces a "" when the strings that are pasted contains NA's in the ... C" "4" but that seems like a detour. Question&Answers:os...

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

0 votes

194 views

1 answer

Removing duplicates from a String in Java

I am trying to iterate through a string in order to remove the duplicates characters. For example the String aabbccdef ... What is the best way to do this? Question&Answers:os...

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

0 votes

178 views

1 answer

How to upload file using JSF 2.2 <h:inputFile>? Where is the saved File?

I would like to be able to upload files in my JSF2.2 web application, so I started using the new <h: ... backing bean, but I don't clearly understand how. Question&Answers:os...

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

0 votes

333 views

1 answer

php - Replace Mcrypt with OpenSSL

currently we have a mcrypt implentation on our systems to crypt some sensible data in our PHP application. Now we ... does it work Maybe any ideas now? Thanks! Question&Answers:os...

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

0 votes

306 views

1 answer

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)

0 votes

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)

0 votes

387 views

1 answer

python - thread starts running before calling Thread.start

t1=threading.Thread(target=self.read()) print("something") t2=threading.Thread(target=self.runChecks(), args=(self,)) ... on to the next line, shouldn't it?) Question&Answers:os...

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

0 votes

150 views

1 answer

r - Select equivalent rows [A-B & B-A]

This question already has an answer here: Question&Answers:os...

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

0 votes

305 views

1 answer

c# - Random number generator with no duplicates

Basically I'm creating a program to randomly generate 6 unique lottery numbers so there is no duplicates in the ... each number unique???? Thanks in advance Question&Answers:os...

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

0 votes

471 views

1 answer

python - How to set the value of a pandas column as list

I want to set the value of a pandas column as a list of strings. However, my efforts to do so didn't succeed ... a cell using at didn't work for me either. Question&Answers:os...

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

0 votes

113 views

1 answer

android - Converting JSONarray to ArrayList

I am downloading a JSON string and converting it to JSONArray. Im putting it into a listview and need to ... by their respective keys. Appreciate any help! Question&Answers:os...

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

0 votes

331 views

1 answer

Find position of a node using XPath

Anyone know how to get the position of a node using XPath? Say I have the following xml: <a> <b>zyx</b> <b ... WriteLine("Found at position = {0}", position); } Question&Answers:os...

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

0 votes

207 views

1 answer

mysql - SQL: What is the default Order By of queries?

What is the default order of a query when no ORDER BY is used? Question&Answers:os...

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

0 votes

258 views

1 answer

.net - String.Join vs. StringBuilder: which is faster?

In a previous question about formatting a double[][] to CSV format, it was suggested that using StringBuilder would be faster than String.Join. Is this true? Question&Answers:os...

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

0 votes

189 views

1 answer

c# - Detailed Explanation of Variable Capture in Closures

I've seen countless posts on how variable capture pulls in variables for the creation of the closure, ... answer involving values and references as well. Question&Answers:os...

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

0 votes

431 views

1 answer

r - Using the %>% pipe, and dot (.) notation

When using map on a nested data_frame, I do not understand why the latter two version give an error, how should I use the ... at level 1 df %>% map(data, min) Question&Answers:os...

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

0 votes

514 views

1 answer

mongodb - Multiple join conditions using the $lookup operator

Have the two following collections: // collection1: { user1: 1, user2: 2, percent: 0.56 } // collection2: { user1: ... : 2, percent1: 0.56, percent2: 0.3 } Question&Answers:os...

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

0 votes

285 views

1 answer

c++ - Why can't I compile an unordered_map with a pair as key?

I am trying to create an unordered_map to map pairs with integers: #include <unordered_map> using namespace std; using ... to use pair as key in unordered maps? Question&Answers:os...

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

0 votes

132 views

1 answer

html - How can get the text of a div tag using only javascript (no jQuery)

I tried this but showing "undefined". function test() { var t = document.getElementById('superman').value ... value using simple Javascript no jQuery Please! Question&Answers:os...

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

0 votes

1.6k views

1 answer

oracle - GROUP BY / aggregate function confusion in SQL

I need a bit of help straightening out something, I know it's a very easy easy question but it's ... simply using 'SELECT order_no' will throw an error? Question&Answers:os...

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

0 votes

124 views

1 answer

c++ - Reusing a moved container?

What is the correct way to reuse a moved container? std::vector<int> container; container.push_back(1); auto ... lead to mistakes. Is my assumption correct? Question&Answers:os...

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

0 votes

137 views

1 answer

Removing html tags from a string in R

I'm trying to read web page source into R and process it as strings. I'm trying to take the paragraphs out ... but I couldn't find a solution involving those. Question&Answers:os...

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

0 votes

236 views

1 answer

.net - What operations are atomic in C#?

Is there a systematic way to know whether an operation in C# will be atomic or not? Or are there any general guidelines or rules of thumb? Question&Answers:os...

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

0 votes

1.1k views

1 answer

url - Java - class.getResource returns null

I am using the following to get the URL of this particular file, but it returns null. Does anyone ... = ExchangeInterceptor.class.getResource("GeoIP.dat"); Question&Answers:os...

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

0 votes

118 views

1 answer

Nesting @media rules in CSS

Support seems to be different across browsers.. Check the link Firefox: Black with white text. Opera, Chrome, IE9: ... background-color: #000; color: #fff; } } Question&Answers:os...

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

0 votes

408 views

1 answer

python - socket.error: [Errno 10013] An attempt was made to access a socket in a way forbidden by its access permissions

I'm trying to create a custom TCP stack using Python 2.6.5 on Windows 7 to serve valid http page requests on ... my local admin account can't access port 80. Question&Answers:os...

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

0 votes

932 views

1 answer

generics - In TypeScript, how to get the keys of an object type whose values are of a given type?

I've been trying to create a type that consists of the keys of type T whose values are strings. In ... Link to a code sample in the TypeScript playground Question&Answers:os...

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

0 votes

148 views

1 answer

c - How to build an executable for Android shell

Sometimes I need to run a command or script on my device, but they are not available or don't exist. Can we add ... there any way to do it? Or it's impossible? Question&Answers:os...

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

Categories

Recent questions

Just Browsing Browsing

Most popular tags