大约有 48,000 项符合查询结果（耗时：0.1120秒） [XML]
How do you make a WPF slider snap only to discrete integer positions?
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answered Oct 6 '08 at 2:10
Brian StewartBrian Stewart
8,4181010 gold badges4949 silver badges6565 bronze badges
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How do I change bash history completion to complete what's already on the line?
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edited Apr 17 '15 at 10:43
Uri
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an...
Mocking Extension Methods with Moq
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edited Jun 20 at 9:12
Community♦
111 silver badge
answered Aug 23 '11 at 6:20
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Drop data frame columns by name
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You can use a simple list of names :
DF <- data.frame(
x=1:10,
y=10:1,
z=rep(5,10),
a=11:20
)
drops <- c("x","z")
DF[ , !(names(DF) %in% drops)]
Or, alternatively, you can make a list of those to keep and refer to them by name :
keeps <- c("y", "a")
DF[keeps]
EDIT ...
How to change value of process.env.PORT in node.js?
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For just one run (from the unix shell prompt):
$ PORT=1234 node app.js
More permanently:
$ export PORT=1234
$ node app.js
In Windows:
set PORT=1234
In Windows PowerShell:
$env:PORT = 1234
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Rails find_or_create_by more than one attribute?
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edited Jan 17 '17 at 12:26
Deepak Mahakale
18.4k77 gold badges5454 silver badges7373 bronze badges
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Turning off some legends in a ggplot
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edited Dec 25 '15 at 20:47
answered Jan 30 '13 at 12:55
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What is an xs:NCName type and when should it be used?
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answered Oct 27 '09 at 15:11
Andrey AdamovichAndrey Adamovich
18.6k1212 gold badges8383 silver badges125125 bronze badges
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How to get a list of properties with a given attribute?
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answered Feb 17 '10 at 16:09
Marc Gravell♦Marc Gravell
888k227227 gold badges23562356 silver badges27202720 bronze badges
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Remove/Add Line Breaks after Specific String using Sublime Text
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edited Oct 26 '12 at 17:20
answered Oct 25 '12 at 20:25
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