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Principal component analysis in Python
I'd like to use principal component analysis (PCA) for dimensionality reduction. Does numpy or scipy already have it, or do I have to roll my own using numpy.linalg.eigh ?
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python: how to send mail with TO, CC and BCC?
...ot only TO specific mailboxes, but CC and BCC them as well. It does not look like smtplib supports CC-ing and BCC-ing while sending emails.
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How to prevent auto-closing of console after the execution of batch file
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In Windows/DOS batch files:
pause
This prints a nice "Press any key to continue . . . " message
Or, if you don't want the "Press any key to continue . . ." message, do this instead:
pause >nul
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How do I address unchecked cast warnings?
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The obvious answer, of course, is not to do the unchecked cast.
If it's absolutely necessary, then at least try to limit the scope of the @SuppressWarnings annotation. According to its Javadocs, it can go on local variables; this way, it doesn't even affect the entire method.
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How do I sort an array of hashes by a value in the hash?
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Ruby's sort doesn't sort in-place. (Do you have a Python background, perhaps?)
Ruby has sort! for in-place sorting, but there's no in-place variant for sort_by in Ruby 1.8. In practice, you can do:
sorted = sort_me.sort_by { |k| k["value"] }
puts sorted
As of Ruby 1.9+, .sort_by! is ...
How do I efficiently iterate over each entry in a Java Map?
...ring, String> entry : map.entrySet()) {
System.out.println(entry.getKey() + "/" + entry.getValue());
}
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Difference between partition key, composite key and clustering key in Cassandra?
...ticles around the net to understand the differences between the following key types. But it just seems hard for me to grasp. Examples will definitely help make understanding better.
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How to compare two strings in dot separated version format in Bash?
...ntil further notice.Paused until further notice.
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Permutations in JavaScript?
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Andreas WongAndreas Wong
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Get querystring from URL using jQuery [duplicate]
... edited Mar 7 '13 at 0:00
Moshe Katz
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answered Jan 11 '11 at 11:01
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