大约有 10,130 项符合查询结果(耗时:0.0341秒) [XML]

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Copying a HashMap in Java

I am trying to keep a temporary container of a class that contains member : 11 Answers ...
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How do I make a column unique and index it in a Ruby on Rails migration?

I would like to make a column unique in Ruby on Rails migration script. What is the best way to do it? Also is there a way to index a column in a table? ...
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Swift Beta performance: sorting arrays

I was implementing an algorithm in Swift Beta and noticed that the performance was very poor. After digging deeper I realized that one of the bottlenecks was something as simple as sorting arrays. The relevant part is here: ...
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Sorting a vector of custom objects

How does one go about sorting a vector containing custom (i.e. user defined) objects. Probably, standard STL algorithm sort along with a predicate (a function or a function object) which would operate on one of the fields (as a key for sorting) in the custom object should be used. Am I on the ...
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Jdbctemplate query for string: EmptyResultDataAccessException: Incorrect result size: expected 1, ac

I am using Jdbctemplate to retrieve a single String value from the db. Here is my method. 17 Answers ...
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Performance of Find() vs. FirstOrDefault() [duplicate]

Got an interesting outcome searching for Diana within a large sequence of a simple reference type having a single string property. ...
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How to find controls in a repeater header or footer

I was wondering how one would find the controls in the HeaderTemplate or FooterTemplate of an Asp.Net Repeater control. 8 A...
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Parallel foreach with asynchronous lambda

I would like to handle a collection in parallel, but I'm having trouble implementing it and I'm therefore hoping for some help. ...
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Pythonic way to find maximum value and its index in a list?

If I want the maximum value in a list, I can just write max(List) , but what if I also need the index of the maximum value? ...
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Principal component analysis in Python

I'd like to use principal component analysis (PCA) for dimensionality reduction. Does numpy or scipy already have it, or do I have to roll my own using numpy.linalg.eigh ? ...