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How to write to Console.Out during execution of an MSTest test
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edited Apr 8 '19 at 12:01
Risadinha
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Convert UTC to local time in Rails 3
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edited Dec 1 '14 at 20:49
answered Mar 14 '11 at 15:23
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What is the difference between t.belongs_to and t.references in rails?
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muffinistamuffinista
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Numbering rows within groups in a data frame
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284
Use ave, ddply, dplyr or data.table:
df$num <- ave(df$val, df$cat, FUN = seq_along)
or:
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How to vertical align an inline-block in a line of text?
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2 Answers
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Active
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What is meant by Scala's path-dependent types?
...al occupied = scala.collection.mutable.Set[Coordinate]()
}
val b1 = Board(20, 20)
val b2 = Board(30, 30)
val c1 = b1.Coordinate(15, 15)
val c2 = b2.Coordinate(25, 25)
b1.occupied += c1
b2.occupied += c2
// Next line doesn't compile
b1.occupied += c2
So, the type of Coordinate is dependent on the ...
Heroku Postgres - terminate hung query (idle in transaction)
...s likely to be the query you'd like to terminate. I'll assume the pid is 1234 below.
You may cancel a query through SQL (i.e. without shell access) as long as it's yours or you have super user access:
select pg_cancel_backend(1234);
That's a "friendly" request to cancel the 1234-query, and with...
Run class in Jar file
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258
Use java -cp myjar.jar com.mypackage.myClass.
If the class is not in a package then simply j...
UUID max character length
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Section 3 of RFC4122 provides the formal definition of UUID string representations. It's 36 characters (32 hex digits + 4 dashes).
Sounds like you need to figure out where the invalid 60-char IDs are coming from and decide 1) if you want to ...
Correct use of flush() in JPA/Hibernate
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edited Nov 25 '10 at 10:29
answered Nov 25 '10 at 10:22
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