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How to convert a data frame column to numeric type?
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answered Feb 19 '10 at 0:31
aL3xaaL3xa
30.7k1717 gold badges7474 silver badges108108 bronze badges
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Is it smart to replace boost::thread and boost::mutex with c++11 equivalents?
...e C++14 (N3891), while std::shared_mutex is available only since C++17 (N4508).
C++11 timeouts are different to Boost timeouts (though this should soon change now Boost.Chrono has been accepted).
Some of the names are different (e.g. boost::unique_future vs std::future)
The argument-passing semantic...
Bytecode features not available in the Java language
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edited Jun 20 at 9:12
community wiki
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How to sort a dataframe by multiple column(s)
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1650
You can use the order() function directly without resorting to add-on tools -- see this simpler ...
Using an ORM or plain SQL? [closed]
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ORMs have some nice features. They can handle much of the dog-work of copying database columns t...
How to create a remote Git repository from a local one?
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Anton Zujev
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answered Jul 11 '11 at 10:53
Kerrek SBKerrek SB
415k7676 gol...
Postgres and Indexes on Foreign Keys and Primary Keys
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PostgreSQL automatically creates indexes on primary keys and unique constraints, but not on the ...
【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
...LE是低功耗蓝牙的英文缩写（Bluetooth Low Energy），是蓝牙4.0版本起开始支持的新的、低功耗版本的蓝牙技术规范。蓝牙技术联盟（Bluetooth SIG）在2010年发布了跨时代的蓝牙4.0，它并不是蓝牙3.0的简单升级版本，而是全新的技术架构...
How does a Java HashMap handle different objects with the same hash code?
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edited Sep 5 '13 at 0:16
Nik
20133 silver badges1616 bronze badges
answered Jun 27 '11 at 13:53
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Async image loading from url inside a UITableView cell - image changes to wrong image while scrollin
...ests for cells that scroll off screen. Thus, if you rapidly scroll to the 100th row, the image for that row could be backlogged behind requests for the previous 99 rows that aren't even visible anymore. You always want to make sure you prioritize requests for visible cells for the best UX.
The sim...