大约有 47,000 项符合查询结果(耗时:0.0336秒) [XML]

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Geometric Mean: is there a built-in?

...pplication I had in mind they are the same, but of course this is not generally true. Thus, if you want to include optional propagation of zeros, and treat the length(x) differently in the case of NA removal, the following is a slightly longer alternative to the function above. gm_mean = function(x...
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Which is more efficient, a for-each loop, or an iterator?

... If you are just wandering over the collection to read all of the values, then there is no difference between using an iterator or the new for loop syntax, as the new syntax just uses the iterator underwater. If however, you mean by loop the old "c-style" loop: for(int i=0; i&l...
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Why would a JavaScript variable start with a dollar sign? [duplicate]

...wish the jquery documentation used this notation as well... It is indeed really helpful. – pedromanoel Jan 28 '14 at 11:05 10 ...
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Why do Java programmers like to name a variable “clazz”? [closed]

...nvention ? I think 'clazz' is not even an English word , has no meaning at all , how can so many programmers name a wrong name coincidentally ? ...
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How to set java_home on Windows 7?

... Find JDK Installation Directory First you need to know the installation path for the Java Development Kit. Open the default installation path for the JDK: C:\Program Files\Java There should be a subdirectory like: C:\Program Files\J...
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Could not load file or assembly 'Newtonsoft.Json' or one of its dependencies. Manifest definition do

... To solve this, I ensured all my projects used the same version by running the following command and checking the results: update-package Newtonsoft.Json -reinstall And, lastly I removed the following from my web.config: <dependentAssembly&gt...
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How to replace all dots in a string using JavaScript

I want to replace all the occurrences of a dot( . ) in a JavaScript string 15 Answers ...
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Why does comparing strings using either '==' or 'is' sometimes produce a different result?

...l reasons: it is inherently O(n) in the length of the strings; it typically requires reads from several regions of memory, which take time; and the reads fills up the processor cache, meaning there is less cache available for other needs. With interned strings, a simple object identi...
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Where do I set my company name?

...lt, Xcode inserts a company name something similar to the following in all new source files (.m .h etc): Copyright (c) 2009 MyCompanyName. All rights reserved. Changing this reference is as simple as entering the following from within a terminal window, replacing “YourNameH...
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When to use EntityManager.find() vs EntityManager.getReference() with JPA

... I usually use getReference method when i do not need to access database state (I mean getter method). Just to change state (I mean setter method). As you should know, getReference returns a proxy object which uses a powerful featu...