大约有 43,100 项符合查询结果（耗时：0.0351秒） [XML]
Array to Hash Ruby
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a = ["item 1", "item 2", "item 3", "item 4"]
h = Hash[*a] # => { "item 1" => "item 2", "item 3" => "item 4" }
That's it. The * is called the splat operator.
One caveat per @Mike Lewis (in the comments): "Be very careful with...
SQL Server: Make all UPPER case to Proper Case/Title Case
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21 Answers
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How can I sharpen an image in OpenCV?
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163
One general procedure is laid out in the Wikipedia article on unsharp masking:
You use a Gauss...
Convert light frequency to RGB?
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answered Sep 24 '09 at 15:47
Stephen MesaStephen Mesa
4,31333 gold badges2121 silver badges1616 bronze badges
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Clojure 1.2.1/1.3/1.4 'proxy generated in Grails 2.0.0 runtime fails. 1.2.0 is fine
... working on extending the Grails Clojure plugin in Grails 2.0.0 (and 2.1.0-SNAPSHOT) and I wanted to update it to Clojure 1.3.0 and add clojure.tools.logging .
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Generating a random & unique 8 character string using MySQL
...E vehicles SET numberplate=concat(
substring('ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789', rand(@seed:=round(rand(@lid)*4294967296))*36+1, 1),
substring('ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789', rand(@seed:=round(rand(@seed)*4294967296))*36+1, 1),
substring('ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789', rand...
python pandas remove duplicate columns
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edited Aug 23 '19 at 13:30
Jean-François Corbett
33.6k2525 gold badges124124 silver badges172172 bronze badges
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Speed up the loop operation in R
...on). The data.frame has roughly 850K rows. My PC is still working (about 10h now) and I have no idea about the runtime.
1...
How to make good reproducible pandas examples
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Note: The ideas here are pretty generic for Stack Overflow, indeed questions.
Disclaimer: Writi...
How to access the last value in a vector?
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11 Answers
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