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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():...
How to override the copy/deepcopy operations for a Python object?
...ions (e.g. sets.py , decimal.py , and fractions.py ), but I'm still not 100% sure I've got it right.
7 Answers
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How do I bind a WPF DataGrid to a variable number of columns?
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answered Dec 7 '10 at 18:01
Fredrik HedbladFredrik Hedblad
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Is there a way to 'uniq' by column?
...h quote)
– user775187
Jun 17 '11 at 10:18
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why do you need the ,1 in -k1,1? why not just -k1?
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How do I add custom field to Python log format string?
...4
rouble
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answered Jul 9 '13 at 21:40
unutbuunutbu
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In-memory size of a Python structure
...bject 8
set 112
str 26
tuple 24
unicode 26
2016-08-01
OSX, Python 2.7.10 (default, Oct 23 2015, 19:19:21) [GCC 4.2.1 Compatible Apple LLVM 7.0.0 (clang-700.0.59.5)] on darwin
decimal 80
dict 280
float 24
int 24
list 72
object 16
set 232
str 38
tuple 56
unicode 52
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Remove all occurrences of a value from a list?
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The code for habnabit's suggestion looks like this: [y for y in x if y != 2]
– coredumperror
Apr 22...
Replace all non Alpha Numeric characters, New Lines, and multiple White Space with one Space
... [A-Za-z0-9_] word characters (including the underscore)
Example at regex101.com
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Measuring elapsed time with the Time module
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