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Principal component analysis in Python
...might have a look at MDP.
I have not had the chance to test it myself, but I've bookmarked it exactly for the PCA functionality.
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Why can't C++ be parsed with a LR(1) parser?
I was reading about parsers and parser generators and found this statement in wikipedia's LR parsing -page:
6 Answers
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what does the __file__ variable mean/do?
I usually just hard-wire these with the actual path. But there is a reason for these statements that determine path at runtime, and I would really like to understand the os.path module so that I can start using it.
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Performance of Arrays vs. Lists
...need iterate frequently, and I mean extremely often. The reasons may vary, but say it's in the heart of the inner most loop of a high volume processing.
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How Pony (ORM) does its tricks?
...Python generator into SQL query in three steps:
Decompiling of generator bytecode and rebuilding generator AST
(abstract syntax tree)
Translation of Python AST into "abstract SQL" -- universal
list-based representation of a SQL query
Converting abstract SQL representation into specific
database-de...
Why does modern Perl avoid UTF-8 by default?
I wonder why most modern solutions built using Perl don't enable UTF-8 by default.
7 Answers
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Design by contract using assertions or exceptions? [closed]
When programming by contract a function or method first checks whether its preconditions are fulfilled, before starting to work on its responsibilities, right? The two most prominent ways to do these checks are by assert and by exception .
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“Large data” work flows using pandas
...y work and it is great for it's out-of-core support. However, SAS is horrible as a piece of software for numerous other reasons.
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Which comment style should I use in batch files?
I've been writing some batch files, and I ran into this user guide , which has been quite informative. One thing it showed me was that lines can be commented not just with REM , but also with :: . It says:
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How can I change Mac OS's default Java VM returned from /usr/libexec/java_home
(Wasn't sure if this should go on SU... migration is certainly an option, but more programmers read questions here, so here goes).
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