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How to prevent ifelse() from turning Date objects into numeric objects
...d class of the inputs.
library(data.table)
dates <- fifelse(dates == '2011-01-01', dates - 1, dates)
str(dates)
# Date[1:5], format: "2010-12-31" "2011-01-02" "2011-01-03" "2011-01-04" "2011-01-05"
dplyr::if_else
From dplyr 0.5.0 release notes:
[if_else] have stricter semantics that ifelse():...
What do Clustered and Non clustered index actually mean?
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Alec Alameddine
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answered Aug 9 '09 at 16:05
Shiraz BhaijiShiraz...
Putting uncommitted changes at Master to a new branch by Git
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answered Aug 29 '09 at 14:34
Samuel CarrijoSamuel Carrijo
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Spring Boot - inject map from application.yml
...ilkinson
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Why does the Scala compiler disallow overloaded methods with default arguments?
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Eugen LabunEugen Labun
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Best way to assert for numpy.array equality?
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120
check out the assert functions in numpy.testing, e.g.
assert_array_equal
for floating point ar...
python: SyntaxError: EOL while scanning string literal
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answered Aug 24 '10 at 23:07
aaronasterlingaaronasterling
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Sort JavaScript object by key
...entation reality, and have officially become incorrect now that the ES6/ES2015 spec has been published.
See the section on property iteration order in Exploring ES6 by Axel Rauschmayer:
All methods that iterate over property keys do so in the same order:
First all Array indices, sorte...
Add a column to existing table and uniquely number them on MS SQL Server
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answered Sep 20 '08 at 14:01
Simon JohnsonSimon Johnson
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How to select all records from one table that do not exist in another table?
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edited Sep 29 '16 at 9:00
answered Apr 21 '10 at 20:20
K...