大约有 43,000 项符合查询结果（耗时：0.0883秒） [XML]
How to count the frequency of the elements in an unordered list?
I need to find the frequency of elements in an unordered list
33 Answers
33
...
Counting the number of elements with the values of x in a vector
I have a vector of numbers:
18 Answers
18
...
What's the nearest substitute for a function pointer in Java?
I have a method that's about ten lines of code. I want to create more methods that do exactly the same thing, except for a small calculation that's going to change one line of code. This is a perfect application for passing in a function pointer to replace that one line, but Java doesn't have func...
How can I apply a function to every row/column of a matrix in MATLAB?
You can apply a function to every item in a vector by saying, for example, v + 1 , or you can use the function arrayfun . How can I do it for every row/column of a matrix without using a for loop?
...
Move assignment operator and `if (this != &rhs)`
In the assignment operator of a class, you usually need to check if the object being assigned is the invoking object so you don't screw things up:
...
Why do we need tuples in Python (or any immutable data type)?
I've read several python tutorials (Dive Into Python, for one), and the language reference on Python.org - I don't see why the language needs tuples.
...
How does a Breadth-First Search work when looking for Shortest Path?
I've done some research, and I seem to be missing one small part of this algorithm. I understand how a Breadth-First Search works, but I don't understand how exactly it will get me to a specific path, as opposed to just telling me where each individual node can go. I guess the easiest way to explain...
Mutex example / tutorial? [closed]
I'm new to multithreading, and was trying to understand how mutexes work. Did a lot of Googling but it still left some doubts of how it works because I created my own program in which locking didn't work.
...
How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
I have two Python dictionaries, and I want to write a single expression that returns these two dictionaries, merged (i.e. taking the union). The update() method would be what I need, if it returned its result instead of modifying a dictionary in-place.
...