大约有 13,922 项符合查询结果（耗时：0.0186秒） [XML]
Is it expensive to use try-catch blocks even if an exception is never thrown?
We know that it is expensive to catch exceptions. But, is it also expensive to use a try-catch block in Java even if an exception is never thrown?
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jQuery get mouse position within an element
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One way is to use the jQuery offset method to translate the event.pageX and event.pageY coordinates from the event into a mouse position relative to the parent. Here's an example for future reference:
$("#something").click(function(e){
var parentOffset = $(this).parent().offset();
//or ...
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?
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How do you detect where two line segments intersect? [closed]
...do I determine whether or not two lines intersect, and if they do, at what x,y point?
27 Answers
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How to pass arguments to a Button command in Tkinter?
...onal module, so you can use that too):
button = Tk.Button(master=frame, text='press', command= lambda: action(someNumber))
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What .NET collection provides the fastest search
... Is there a collection object (like List , HashTable ) that provides an exceptionly fast Contains() method? Or will I have to write my own? In otherwords, is the default Contains() method just scan each item or does it use a better search algorithm.
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Python 2.7 getting user input and manipulating as string without quotations
... readline -- this will give features similar to bash (history out-of-the-box, auto-completion will require some legwork)
– Foo Bah
Feb 10 '11 at 17:10
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What is the advantage of GCC's __builtin_expect in if else statements?
I came across a #define in which they use __builtin_expect .
6 Answers
6
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python tuple to dict
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Try:
>>> t = ((1, 'a'),(2, 'b'))
>>> dict((y, x) for x, y in t)
{'a': 1, 'b': 2}
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Call int() function on every list element?
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This is what list comprehensions are for:
numbers = [ int(x) for x in numbers ]
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