大约有 40,800 项符合查询结果（耗时：0.0233秒） [XML]
Difference between classification and clustering in data mining? [closed]
Can someone explain what the difference is between classification and clustering in data mining?
21 Answers
...
django MultiValueDictKeyError error, how do I deal with it
...
Use the MultiValueDict's get method. This is also present on standard dicts and is a way to fetch a value while providing a default if it does not exist.
is_private = request.POST.get('is_private', False)
Generally,
my_var = dict.get(<key>, <default&g...
how to calculate binary search complexity
... say that since binary search halves the input required to search hence it is log(n) algorithm. Since I am not from a mathematics background I am not able to relate to it. Can somebody explain it in a little more detail? does it have to do something with the logarithmic series?
...
Is Ruby pass by reference or by value?
...
In traditional terminology, Ruby is strictly pass-by-value. But that's not really what you're asking here.
Ruby doesn't have any concept of a pure, non-reference value, so you certainly can't pass one to a method. Variables are always references to objects....
How is AngularJS different from jQuery
I only know one js library and that is jQuery .
But my other coders in the group are changing AngularJS as their default library in new project.
...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...Massachusetts Avenue, Cambridge, MA 02139, USA
ABSTRACT
MIT App Inventor is a block-based event-driven programming tool that allows everyone, especially novices, to start programming and building fully functional apps for Android devices. Compared to traditional text programming with Android Studi...
What does `kill -0 $pid` in a shell script do?
... the signal 0 to a given PID just checks if any process with the given PID is running and you have the permission to send a signal to it.
For more information see the following manpages:
kill(1)
$ man 1 kill
...
If sig is 0, then no signal is sent, but error checking is still performed.
...
kil...
How is the fork/join framework better than a thread pool?
...
I think the basic misunderstanding is, that the Fork/Join examples do NOT show work stealing but only some kind of standard divide and conquer.
Work stealing would be like this: Worker B has finished his work. He is a kind one, so he looks ar...
What is ANSI format?
What is ANSI encoding format? Is it a system default format?
In what way does it differ from ASCII?
10 Answers
...
Is Big O(logn) log base e?
For binary search tree type of data structures, I see the Big O notation is typically noted as O(logn). With a lowercase 'l' in log, does this imply log base e (n) as described by the natural logarithm? Sorry for the simple question but I've always had trouble distinguishing between the different...