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Rails 3 migrations: Adding reference column?
If I create a new rails 3 migration with (for example)
10 Answers
10
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How to not run an example using roxygen2?
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Use \dontrun{}
#'@examples
#'\dontrun{
#'geocode("3817 Spruce St, Philadelphia, PA 19104")
#'geocode("Philadelphia, PA")
#'dat <- data.frame(value=runif(3),address=c("3817 Spruce St, Philadelphia, PA 19104","Philadelphia, PA","Neverneverland"))
#'geocode(dat)
#'}
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What is the difference between an expression and a statement in Python?
...duced to some kind of "value", which can be any Python object. Examples:
3 + 5
map(lambda x: x*x, range(10))
[a.x for a in some_iterable]
yield 7
Statements (see 1, 2), on the other hand, are everything that can make up a line (or several lines) of Python code. Note that expressions are stateme...
Most efficient way to reverse a numpy array
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edited May 23 '17 at 12:26
Community♦
111 silver badge
answered Jul 21 '11 at 5:25
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Convert all strings in a list to int
...the map function (in Python 2.x):
results = map(int, results)
In Python 3, you will need to convert the result from map to a list:
results = list(map(int, results))
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List of tuples to dictionary
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edited Dec 13 '19 at 23:38
Boris
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a...
How can you dynamically create variables via a while loop? [duplicate]
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edited Feb 18 '11 at 2:37
answered Feb 18 '11 at 1:28
Jo...
Limit File Search Scope in Sublime Text 2
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319
Add and edit this in your ~/Library/Application Support/Sublime Text 2/Packages/User/Preferenc...
How to implement a queue with three stacks?
...SUMMARY
O(1) algorithm is known for 6 stacks
O(1) algorithm is known for 3 stacks, but using lazy evaluation which in practice corresponds to having extra internal data structures, so it does not constitute a solution
People near Sedgewick have confirmed they are not aware of a 3-stack solution wi...