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What characters are allowed in an email address?
...dards (Request for Comments) for protocols mandate that component hostname labels may contain only the ASCII letters a through z (in a case-insensitive manner), the digits 0 through 9, and the hyphen (-). The original specification of hostnames in RFC 952, mandated that labels could not start with a...
Comments in Markdown
...not be able to see it, even with "view source") you could (ab)use the link labels (for use with reference style links) that are available in the core Markdown specification:
http://daringfireball.net/projects/markdown/syntax#link
That is:
[comment]: <> (This is a comment, it will not be inc...
How do I determine k when using k-means clustering?
...ange_n_clusters:
clusterer = KMeans(n_clusters=n_clusters)
cluster_labels = clusterer.fit_predict(dataToFit)
silhouette_avg = silhouette_score(dataToFit, cluster_labels)
if silhouette_avg > previous_silh_avg:
previous_silh_avg = silhouette_avg
best_clusters = n_clu...
与复制构造函数相关的错误.例如:0x77D9FCAA (ntdll.dll) (prog31.exe 中)处...
...常: 0xC0000374:堆已损坏。 (参数: 0x77DC6668)这种错误可能就是与内存有关的释放问题。这里的错误示例代码主要是为了说明复制构造函数，尤其是含有指针类型或者有成员表示在构造函数中分...这种错误可能就是与内存有关的释放...
为维护国家安全 中国限制出口无人机和高性能计算机 - 资讯 - 清泛网 - 专注...
...出口无人机和高性能计算机长期以来，欧美发达国家尤其是美国一直维持着高科技产品的对华出口禁令，尤其是近年来随着中国天河二号等超级计算机的崛起，美国又在高性能...长期以来，欧美发达国家尤其是美国一直维持着高...
Why does !{}[true] evaluate to true in JavaScript?
... @t.niese, because it's parsed as a statement block containing a label (key:) and a string literal ("value"), followed by an array. The parser still does not see an object literal.
– Frédéric Hamidi
Oct 31 '13 at 9:54
...
how to use ng-option to set default value of select element
...n <select> with ng-options. Also it will work if you have different label/values.
* This is from Angular 1.2.7
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What can , and be used for?
...action="#{bean.search}" />
</f:metadata>
...
<form>
<label for="query">Query</label>
<input type="text" name="query" value="#{empty bean.query ? param.query : bean.query}" />
<input type="submit" value="Search" />
<h:message for="query" />...
Text-align class for inside a table
... class="table price-table">
<thead>
<th class="price-label">Total</th>
</thead>
<tbody>
<tr>
<td class="price-value">$1,000,000.00</td>
</tr>
</tbody>
</table>
And just apply the text-a...
What are the benefits of functional programming? [closed]
...h an array doing something to each cell, you'd say the equivalent of "this label refers to a version of this array where this function has been done on all the elements."
Functional programming moves more basic programming ideas into the compiler, ideas such as list comprehensions and caching.
The...