大约有 40,000 项符合查询结果（耗时：0.0424秒） [XML]
Homebrew: List only installed top level formulas
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Is memcached a dinosaur in comparison to Redis? [closed]
... before nor have I evaluated it, but this may be of interest to you. code.google.com/p/memagent
– Daniel
May 23 '10 at 17:22
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how to find host name from IP with out login to the host
...tch.
DNS is by far the most common and is used both on the internet (like google.com. A 216.58.218.142) and at home (mDNS/LLMNR), so here's how to perform a reverse DNS lookup: dig -x <address> (nslookup and host are simpler, provide less detail, and may even return different results; however...
Regex to match a digit two or four times
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Git search for string in a single file's history
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Python string.join(list) on object array rather than string array
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Extracting Nupkg files using command line
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What is the difference between HTTP status code 200 (cache) vs status code 304?
I'm using the Google "Page Speed" plug-in for Firefox to access my web site.
5 Answers
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Cluster analysis in R: determine the optimal number of clusters
...Look for a bend or elbow in the sum of squared error (SSE) scree plot. See http://www.statmethods.net/advstats/cluster.html & http://www.mattpeeples.net/kmeans.html for more. The location of the elbow in the resulting plot suggests a suitable number of clusters for the kmeans:
mydata <- d
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Getting HTTP code in PHP using curl
...could save a lot of time:
if(!$url || !is_string($url) || ! preg_match('/^http(s)?:\/\/[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(\/.*)?$/i', $url)){
return false;
}
Make sure you only fetch the headers, not the body content:
@curl_setopt($ch, CURLOPT_HEADER , true); // we want headers
@curl_setop...