大约有 32,000 项符合查询结果（耗时：0.0161秒） [XML]
Get index of array element faster than O(n)
Given I have a HUGE array, and a value from it. I want to get index of the value in array. Is there any other way, rather then call Array#index to get it? The problem comes from the need of keeping really huge array and calling Array#index enormous amount of times.
...
How come an array's address is equal to its value in C?
...
The name of an array usually evaluates to the address of the first element of the array, so array and &array have the same value (but different types, so array+1 and &array+1 will not be equal if the array is more than 1 element lon...
PHP Multidimensional Array Searching (Find key by specific value)
I have this multidimensional array. I need to search it and return only the key that matches the value of the "slug". I know there are other threads about searching multidimensional arrays, but I'm not really understanding enough to apply to my situation. Thanks very much for any help!
...
Sort array of objects by single key with date value
I have an array of objects with several key value pairs, and I need to sort them based on 'updated_at':
19 Answers
...
Why isn't the size of an array parameter the same as within main?
Why isn't the size of an array sent as a parameter the same as within main?
13 Answers
...
What's the fastest algorithm for sorting a linked list?
...outine). Thanks to the inherently different behaviour of linked lists from arrays, this Mergesort implementation avoids the O(N) auxiliary storage cost normally associated with the algorithm.
There is also an example implementation in C that work for both singly and doubly linked lists.
As @Jørg...
How can I add new array elements at the beginning of an array in Javascript?
I have a need to add or prepend elements at the beginning of an array.
12 Answers
12
...
How to convert array to SimpleXML
How can I convert an array to a SimpleXML object in PHP?
33 Answers
33
...
How to convert object array to string array in Java
I use the following code to convert an Object array to a String array :
11 Answers
11
...
How does python numpy.where() work?
...short answer is that they don't.
Any sort of logical operation on a numpy array returns a boolean array. (i.e. __gt__, __lt__, etc all return boolean arrays where the given condition is true).
E.g.
x = np.arange(9).reshape(3,3)
print x > 5
yields:
array([[False, False, False],
[Fals...