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How to join (merge) data frames (inner, outer, left, right)
... the merge function and its optional parameters:
Inner join: merge(df1, df2) will work for these examples because R automatically joins the frames by common variable names, but you would most likely want to specify merge(df1, df2, by = "CustomerId") to make sure that you were matching on only the f...
Separate REST JSON API server and client? [closed]
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At Boundless, we've gone deep with option #2 and rolled it out to thousands of students. Our server is a JSON REST API (Scala + MongoDB), and all of our client code is served straight out of CloudFront (ie: www.boundless.com is just an alias for CloudFront).
Pros:
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Build.scala, % and %% symbols meaning
I'm new to Play! Framework 2.1 (java version) and have no experience with scala. I don't understand what are and what does % and %% mean in Build.scala. I googled about them but couldn't find their meaning.
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Rails.env vs RAILS_ENV
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edited Jan 6 '14 at 21:40
sameers
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Explanation of JSONB introduced by PostgreSQL
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edited May 22 '14 at 0:58
theory
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How fast is D compared to C++?
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edited Feb 28 '11 at 23:44
answered Feb 28 '11 at 13:14
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Is it possible to run selenium (Firefox) web driver without a GUI?
...ding our production server from Ubuntu- desktop 10.04 to Ubuntu- server 12.04.
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best way to preserve numpy arrays on disk
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answered Mar 8 '12 at 15:02
JoshAdelJoshAdel
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Difference between var_dump,var_export & print_r
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