大约有 47,000 项符合查询结果（耗时：0.1271秒） [XML]
To find whether a column exists in data frame or not
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202
Assuming that the name of your data frame is dat and that your column name to check is "d", you...
How do you pass arguments to define_method?
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edited Sep 18 '08 at 3:12
answered Sep 18 '08 at 3:06
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Remove multiple attributes with jQuery's removeAttr
... Denys SéguretDenys Séguret
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What are libtool's .la file for?
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It is a textual file that includes a description of the library.
It allows libtool to create pl...
Base64 encoding and decoding in client-side Javascript
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Some browsers such as Firefox, Chrome, Safari, Opera and IE10+ can handle Base64 natively. Take a look at this Stackoverflow question. It's using btoa() and atob() functions.
For server-side JavaScript (Node), you can use Buffers to decode.
If you are going for a cross-browser solut...
How can I manipulate the strip text of facet_grid plots?
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opts(strip.text.x = theme_text(size = 8, colour = "red", angle = 90))
Update: for ggplot2 version > 0.9.1
qplot(hwy, cty, data = mpg) +
facet_grid(. ~ manufacturer) +
theme(strip.text.x = element_text(size = 8, colour = "red", angle = 90))
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Embed SVG in SVG?
...ur SVG file. For fun, save the following as recursion.svg:
<svg width="100%" height="100%" viewBox="-100 -100 200 200" version="1.1"
xmlns="http://www.w3.org/2000/svg">
<circle cx="-50" cy="-50" r="30" style="fill:red" />
<image x="10" y="20" width="80" height="80" href="recu...
Does a dot have to be escaped in a character class (square brackets) of a regular expression?
... lilactiger89lilactiger89
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Git merge left HEAD marks in my files
...D <-+ remove the bits here
digits:[0-9]+ |
{ return digits.join(""); } |
======= <-+
sign:"-"* digits:[0-9]+
{ return sign + digits.join(""); }
>>>&...
MongoDB/Mongoose querying at a specific date?
...osts.find( //query today up to tonight
{"created_on": {"$gte": new Date(2012, 7, 14), "$lt": new Date(2012, 7, 15)}})
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