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filter for complete cases in data.frame using dplyr (case-wise deletion)
... num 1 2
## $ x2: num 1 2
## - attr(*, "na.action")= 'omit' Named int 3 4
## ..- attr(*, "names")= chr "3" "4"
ADDED Have updated to reflect latest version of dplyr and comments.
ADDED Have updated to reflect latest version of tidyr and comments.
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Does async(launch::async) in C++11 make thread pools obsolete for avoiding expensive thread creation
...y are expected to return, it's not OK to be ignoring exceptions.
Question 3:
Personally, I like thread launches to be explicit. I place a lot of value on islands where you can guarantee serial access. Otherwise you end up with mutable state that you always have to be wrapping a mutex around somewh...
Select SQL Server database size
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232
Try this one -
Query:
SELECT
database_name = DB_NAME(database_id)
, log_size_mb = ...
How do you use Mongoose without defining a schema?
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answered Sep 12 '12 at 13:21
Jonathan P. DiazJonathan P. Diaz
2,56511 gold badge1515 silver badges1313 bronze badges
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What is the source code of the “this” module doing?
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This is called rot13 encoding:
d = {}
for c in (65, 97):
for i in range(26):
d[chr(i+c)] = chr((i+13) % 26 + c)
Builds the translation table, for both uppercase (this is what 65 is for) and lowercase (this is what 97 is for) char...
How do you generate dynamic (parameterized) unit tests in python?
...r/local/lib/python2.7/site-packages/parameterized/parameterized.py", line 233, in <lambda>
standalone_func = lambda *a: func(*(a + p.args), **p.kwargs)
File "x.py", line 12, in test_sequence
self.assertEqual(a,b)
AssertionError: 'a' != 'b'
For historical reasons I'll leave the orig...
Create JSON-object the correct way
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edited Mar 5 '19 at 22:34
answered Jul 19 '10 at 13:21
C...
What do the &,
...ion - 2.2 Structures for further details (or if you need even moar docs++: 3.2.2.2. Anchors and Aliases)
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CMake output/build directory
...e some complicated 50 lines of CMake script in order to make a program for 3 different compilers. This probably concludes all my knowledge in CMake.
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Difference between Visibility.Collapsed and Visibility.Hidden
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