大约有 41,000 项符合查询结果（耗时：0.0536秒） [XML]
Why does PHP consider 0 to be equal to a string?
...
You are doing == which sorts out the types for you.
0 is an int, so in this case it is going to cast 'e' to an int. Which is not parsable as one and will become 0. A string '0e' would become 0 and would match!
Use ===
...
Convert a matrix to a 1 dimensional array
...
Either read it in with 'scan', or just do as.vector() on the matrix. You might want to transpose the matrix first if you want it by rows or columns.
> m=matrix(1:12,3,4)
> m
[,1] [,2] [,3] [,4]
[1,] 1 4 7 10
[2,] 2 5 8 11...
Difference between maven scope compile and provided for JAR packaging
...t as a JAR? If it was WAR, I'd understand - the artifact would be included or not in WEB-INF/lib. But in case of a JAR it doesn't matter - dependencies aren't included. They have to be on classpath when their scope is compile or provided . I know that provided dependencies aren't transitive - b...
How to only find files in a given directory, and ignore subdirectories using bash
...unning the find command to find certain files, but some files in sub-directories have the same name which I want to ignore. Thanks for any help. Below is the command that I'm using:
...
Creating threads - Task.Factory.StartNew vs new Thread()
...xecuted synchronous if appropiate.
If you have a long running background work you should specify this by using the correct Task Option.
You should prefer Task Parallel Library over explicit thread handling, as it is more optimized. Also you have more features like Continuation.
...
What is the difference between instanceof and Class.isAssignableFrom(…)?
...
i don't get it - please elaborate on why we can't write a instanceof Bref.getClass(). how can this be the accepted answer with so little explanation (or its lack thereof)?
– Eliran Malka
Mar 28 '13 at 12:58
...
Objective-C: Where to remove observer for NSNotification?
.../no longer in a state in which they can properly handle the notification. For this... See above.
Edit (since the answer seems to draw more comments than I would have thought) All I am trying to say here is: it's really hard to give general advice as to when it's best to remove the observer from the...
How do I unlock a SQLite database?
How do I unlock the database so this will work?
35 Answers
35
...
Open a URL in a new tab (and not a new window)
...
Nothing an author can do can choose to open in a new tab instead of a new window; it is a user preference. (Note that the default user preference in most browsers is for new tabs, so a trivial test on a browser where that preference hasn't ...
What are the git concepts of HEAD, master, origin?
As I'm learning about git, I keep coming across the terms HEAD, master, origin, and I'm not sure what the differences are. If I understand correctly, HEAD is always equal to the latest revision? And if so, is that the latest revision of the whole repository, or of a specific branch or tag? This is s...