Recent questions tagged Data

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data binding - How can i register a global custom editor in Spring-MVC?

I use the following custom editor in MANY Spring-MVC controllers according to: A controller binder. ... controller ? regards, See Question&Answers more detail:os...

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

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data structures - Java implementation for Min-Max Heap?

Do you know of a popular library (Apache, Google, etc, collections) which has a reliable Java implementation for a min ... element in O(log n)? See Question&Answers more detail:os...

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

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data structures - Chained Hash Tables vs. Open-Addressed Hash Tables

Can somebody explain the main differences between (advantages / disadvantages) the two implementations? For a ... implementation is recommended? See Question&Answers more detail:os...

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

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data cleaning - R: how to sum columns grouped by a factor?

If I have a table like this: user,v1,v2,v3 a,1,0,0 a,1,0,1 b,1,0,0 b,2,0,3 c,1,1,1 How to I turn it into this ... ,v2,v3 a,2,0,1 b,3,0,3 c,1,1,1 See Question&Answers more detail:os...

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

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data binding - Drag and drop from datasource to WPF window not working

I have been tasked to design a contact management program for my company. We have VS 2012 and since I ... everywhere. Any help is 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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data structures - get list of anagrams from a dictionary

Basically, Anagrams are like permutation of string.E.g stack ,sackt ,stakc all are anagrams of stack (thought ... also be helpful. Thanks. See Question&Answers more detail:os...

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

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data access layer - Nullable values in C++

I'm creating a database access layer in native C++, and I'm looking at ways to support NULL values. Here ... How do others solve this problem? See Question&Answers more detail:os...

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

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data structures - How can I maintain the order of keys I add to a Perl hash?

How can I maintain the order of actual list after counting its occurrence using a hash in the following program? For ... [$i] $array_2[$i]"; } See Question&Answers more detail:os...

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

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data structures - Using a Python Dictionary as a Key (Non-nested)

Python doesn't allow dictionaries to be used as keys in other dictionaries. Is there a workaround for using non- ... my use case was incorrect. See Question&Answers more detail:os...

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

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data science - Removing non-English words from text using Python

I am doing a data cleaning exercise on python and the text that I am cleaning contains Italian words which I ... help would be much 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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data binding - Can't resolve Android databinding class

While using data binding , I am not able to get class MainActivityBinding as per Data Binding Guide My layout name is ... but it can't help me. See Question&Answers more detail:os...

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

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data structures - C++ - interval tree implementation

Does someone know any good interval tree implementation in C++? Obviously, something template-driven, better in ... ) operations) in practice? See Question&Answers more detail:os...

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

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663 views

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data structures - Why can hashCode() return the same value for different objects in Java?

A quote from the book I'm reading Head First Java: The point is that hashcodes can be the same without ... ? Does that not cause problems? See Question&Answers more detail:os...

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

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735 views

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data annotations - ASP.Net MVC DisplayFormat

In my model I have the following DataAnnotations on one of my properties [Required(ErrorMessage = "*")] ... remove this using DataAnnotations? See Question&Answers more detail:os...

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

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data structures - How to clone object in C++ ? Or Is there another solution?

I wrote a Stack and Queue implementation (Linked List based). There is one stack (bigStack). For ... ; copyStack.DisplayStack(); See Question&Answers more detail:os...

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

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754 views

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data structures - MATLAB linked list

What are some possible ways to implement a linked list in MATLAB? Note: I am asking this question for ... will help me understand them. See Question&Answers more detail:os...

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

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data structures - Test whether a list contains a specific value in Clojure

What is the best way to test whether a list contains a given value in Clojure? In particular, the behaviour of ... a standard way to do this? See Question&Answers more detail:os...

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

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data structures - Difference between "Complete binary tree", "strict binary tree","full binary Tree"?

I am confused about the terminology of the below trees, I have been studying the Tree, and I am unable to ... trees are used in Data Structure? See Question&Answers more detail:os...

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

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data modeling - What are design patterns to support custom fields in an application?

We develop a commercial application. Our customers are asking for custom fields support. For instance, they want ... support will get larger. See Question&Answers more detail:os...

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

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data binding - WPF MVVM INotifyPropertyChanged Implementation - Model or ViewModel

I have read a number of debates on where to implement INotifyPropertyChanged here on StackOverflow and other blogs but ... in the Model? Thanks. See Question&Answers more detail:os...

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

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582 views

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data binding - WPF Databind Before Saving

In my WPF application, I have a number of databound TextBoxes. The UpdateSourceTrigger for these bindings is LostFocus. The ... get; set; } } } See Question&Answers more detail:os...

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

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data structures - Why hashmap lookup is O(1) i.e. constant time?

If we look from Java perspective then we can say that hashmap lookup takes constant time. But what about ... constant time? Please explain. See Question&Answers more detail:os...

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

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799 views

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data binding - WPF: Display a bool value as "Yes" / "No"

I have a bool value that I need to display as "Yes" or "No" in a TextBlock. I am trying to do this ... seems more elegant (if it worked). See Question&Answers more detail:os...

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

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630 views

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data binding - What is Lazy Loading?

What is Lazy Loading? [Edit after reading a few answers] Why do people use this term so often? Say you just ... what "other" types are their? See Question&Answers more detail:os...

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

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data structures - Why doesn't java.util.Set have get(int index)?

I'm sure there's a good reason, but could someone please explain why the java.util.Set interface lacks get ... for the fantastic answers below. See Question&Answers more detail:os...

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

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833 views

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data structures - Advantages of Binary Search Trees over Hash Tables

What are the advantages of binary search trees over hash tables? Hash tables can look up any element in Theta(1 ... going the other way around. See Question&Answers more detail:os...

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

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720 views

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data structures - Fetching linked list in MySQL database

I have a MySQL database table with this structure: table id INT NOT NULL PRIMARY KEY data .. next_id INT ... to check for circular references. See Question&Answers more detail:os...

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

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748 views

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data structures - How to create a 2 way map in java

I need a data structure to store string-int value pairs in an 1:1 relationship, and being able too look up from ... a ton of code either :P. See Question&Answers more detail:os...

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

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