大约有 43,000 项符合查询结果（耗时：0.0603秒） [XML]
Abusing the algebra of algebraic data types - why does this work?
The 'algebraic' expression for algebraic data types looks very suggestive to someone with a background in mathematics. Let me try to explain what I mean.
...
How do multiple clients connect simultaneously to one port, say 80, on a server? [duplicate]
I understand the basics of how ports work. However, what I don't get is how multiple clients can simultaneously connect to say port 80. I know each client has a unique (for their machine) port. Does the server reply back from an available port to the client, and simply state the reply came from 80? ...
Why does string::compare return an int?
Why does string::compare return an int instead of a smaller type like short or char ? My understanding is that this method only returns -1, 0 or 1.
...
Replace all elements of Python NumPy Array that are greater than some value
I have a 2D NumPy array and would like to replace all values in it greater than or equal to a threshold T with 255.0. To my knowledge, the most fundamental way would be:
...
Convert a list of characters into a string
If I have a list of chars:
9 Answers
9
...
What is the best Distributed Brute Force countermeasure?
First, a little background: It is no secret that I am implementing an auth+auth system for CodeIgniter, and so far I'm winning (so to speak). But I've run into a pretty non-trivial challenge (one that most auth libraries miss entirely, but I insist on handling it properly): how to deal intelligently...
When to use a View instead of a Table?
When should a View actually be used over an actual Table? What gains should I expect this to produce?
8 Answers
...
Extracting specific columns from a data frame
I have an R data frame with 6 columns, and I want to create a new dataframe that only has three of the columns.
10 Answers
...
Count the number occurrences of a character in a string
What's the simplest way to count the number of occurrences of a character in a string?
19 Answers
...
Should I use PATCH or PUT in my REST API?
I want to design my rest endpoint with the appropriate method for the following scenario.
6 Answers
...