大约有 3,285 项符合查询结果(耗时:0.0331秒) [XML]

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Is multiplication and division using shift operators in C actually faster?

...ent clearly (i.e. i*2 rather than i << 1) and let it decide what the fastest assembly/machine code sequence is. It's even possible that the processor itself has implemented the multiply instruction as a sequence of shifts & adds in microcode. Bottom line--don't spend a lot of time worryi...
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Infinity symbol with HTML

...previous ∞? How do you get it there the first time? I find it easier and faster to type ∞, but if there's a faster way to get this on to the screen with just a plain ol' keyboard, please share – FrustratedWithFormsDesigner Feb 12 '10 at 21:00 ...
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How can I select the first day of a month in SQL?

... It is probably quite fast. Why not create it as a sql function. CREATE FUNCTION [dbo].[GetFirstDayOfMonth] ( @InputDate DATETIME ) RETURNS DATETIME BEGIN RETURN CAST(CAST(YEAR(@InputDate) AS VARCHAR(4)) + '/' + CAST(MON...
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How to convert an array of strings to an array of floats in numpy?

... 512 strings which represent floating point numbers, this approach was the fastest (slightly faster than pradeep bisht's answer, about 1.5 times faster than Thomio's answer, and more than twice as fast as the accepted answer). Have an upvote! – jodag Aug 13 '18...
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How do I determine the size of an object in Python?

...eferents to do this search because it works at the C level (making it very fast). The downside is that get_referents can return redundant members, so we need to ensure we don't double count. Classes, modules, and functions are singletons - they exist one time in memory. We're not so interested in th...
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What's the fastest way to merge/join data.frames in R?

...hen the match and merge approaches are not the same. Match is, of course, faster since it is not doing as much. In particular it never looks for duplicate keys. (continued after code) DF1 = data.frame(a = c(1, 1, 2, 2), b = 1:4) DF2 = data.frame(b = c(1, 2, 3, 3, 4), c = letters[1:5]) merge(DF1, D...
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php implode (101) with quotes

... simple as fast as it gets – Jeffz Aug 28 '13 at 10:02 ...
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Why does my application spend 24% of its life doing a null check?

..., it is accessing memory. The execution core of a modern CPU is many times faster than the memory bus. A problem related to distance, the further an electrical signal has to travel, the harder it gets to get that signal delivered to the other end of the wire without it being corrupted. The only cure...
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How to set my phpmyadmin user session to not time out so quickly? [duplicate]

... In ubuntu, config.inc.php is accessed fast and easy by sudo gedit /etc/phpmyadmin/config.inc.php – davidkonrad Nov 25 '14 at 17:10 16 ...
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How to export revision history from mercurial or git to cvs?

...kip this step. Incremental Imports Subsequent git cvsimport should be much faster than the first invocation. It does, however, do an cvs rlog on every directory (even those that have only files in Attic) so it can still take a few minutes. If you've specified the suggested configs above, all you n...