大约有 40,000 项符合查询结果（耗时：0.0740秒） [XML]
Pandas dataframe get first row of each group
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How do I select elements of an array given condition?
Suppose I have a numpy array x = [5, 2, 3, 1, 4, 5] , y = ['f', 'o', 'o', 'b', 'a', 'r'] . I want to select the elements in y corresponding to elements in x that are greater than 1 and less than 5.
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Create an index on a huge MySQL production table without table locking
I need to create an index on a ~5M rows MySQL table. It is a production table, and I fear a complete block of everything if I run a CREATE INDEX statement...
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Why is LINQ JOIN so much faster than linking with WHERE?
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edited Apr 5 '11 at 12:14
answered Apr 5 '11 at 12:06
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Java: how can I split an ArrayList in multiple small ArrayLists?
...t<Integer> numbers = new ArrayList<Integer>(
Arrays.asList(5,3,1,2,9,5,0,7)
);
List<Integer> head = numbers.subList(0, 4);
List<Integer> tail = numbers.subList(4, 8);
System.out.println(head); // prints "[5, 3, 1, 2]"
System.out.println(tail); // prints "[9, 5, 0, 7]"
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Select all child elements recursively in CSS
... asterisk * matches any element.
Official Specification: CSS 2.1: Chapter 5.5: Descendant Selectors
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How to convert list of key-value tuples into dictionary?
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answered Jul 5 '11 at 17:28
ninjageckoninjagecko
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bash assign default value
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camhcamh
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What's the difference between “mod” and “remainder”?
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