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MongoDB aggregation framework match OR
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Assign pandas dataframe column dtypes
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Make Adobe fonts work with CSS3 @font-face in IE9
...o get rid of the "CSS3114" error. For an online tool, click here: https://www.andrebacklund.com/fontfixer.html
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When to use in vs ref vs out
... this yourtube video which demonstrates the difference practically https://www.youtube.com/watch?v=lYdcY5zulXA
Below image shows the differences more visually
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Converting Python dict to kwargs?
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What are the differences between git remote prune, git prune, git fetch --prune, etc
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How does lucene index documents?
...airly good article here: https://web.archive.org/web/20130904073403/http://www.ibm.com/developerworks/library/wa-lucene/
Edit 12/2014: Updated to an archived version due to the original being deleted, probably the best more recent alternative is http://lucene.apache.org/core/3_6_2/fileformats.html
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Is it valid to have a tag inside another tag?
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What is the dual table in Oracle?
...unction in a select statement:
e.g. select sysdate from dual;
See http://www.adp-gmbh.ch/ora/misc/dual.html
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Convert string to a variable name
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There is another simple solution found there:
http://www.r-bloggers.com/converting-a-string-to-a-variable-name-on-the-fly-and-vice-versa-in-r/
To convert a string to a variable:
x <- 42
eval(parse(text = "x"))
[1] 42
And the opposite:
x <- 42
deparse(substitute(x))
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