大约有 47,000 项符合查询结果（耗时：0.0804秒） [XML]
SVG: text inside rect
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Programmatically using D3:
body = d3.select('body')
svg = body.append('svg').attr('height', 600).attr('width', 200)
rect = svg.append('rect').transition().duration(500).attr('width', 150)
.attr('height', 100)
.attr('x', 40)
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Efficient way to apply multiple filters to pandas DataFrame or Series
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e can also select rows based on values of a column that are not in a list or any iterable. We will create boolean variable just like before, but now we will negate the boolean variable by placing ~ in the front.
For example
list = [1...
Simultaneously merge multiple data.frames in a list
... c 3 5 7
We don't have to take all columns, we can use select helpers from tidyselect and
choose (as we start from .x all .x columns are kept):
eat(x, list(y,z), starts_with("l") ,.by = "i")
# # A tibble: 3 x 3
# i j l
# <chr> <int> <int>
# 1 a ...
How do I specify the platform for MSBuild?
... project of the solution, no matter what mix of project configurations you selected in Visual Studio.
– Laurent LA RIZZA
Oct 8 '16 at 12:37
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Is “IF” expensive?
...nation on Cell Performance. Another fun one is this post about branchless selections on the Real Time Collision Detection Blog.
In addition to the excellent answers already posted in response to this question, I'd like to put in a reminder that although "if" statements are considered expensive low...
Eager load polymorphic
...edTable error ( tested in Rails 3, not 4 ) because the association will do SELECT FROM shops WHERE shop.id = 1 AND ( reviews.review_type = 'Shop' ).
The :include option will force a JOIN instead. :)
share
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Overloading member access operators ->, .*
...nter dereference operator, or it must return a pointer that can be used to select what the pointer dereference operator arrow is pointing at."
Bruce Eckel: Thinking CPP Vol-one : operator->
The extra functionality is provided for convenience, so you do not have to call
a->->func();
You ...
HSL to RGB color conversion
... CSS 3 specification, which reads:
HOW TO RETURN hsl.to.rgb(h, s, l):
SELECT:
l<=0.5: PUT l*(s+1) IN m2
ELSE: PUT l+s-l*s IN m2
PUT l*2-m2 IN m1
PUT hue.to.rgb(m1, m2, h+1/3) IN r
PUT hue.to.rgb(m1, m2, h ) IN g
PUT hue.to.rgb(m1, m2, h-1/3) IN b
RETURN (r, g, ...
Add a dependency in Maven
...rowser window (groupId, artifactId, version) into corresponding fields in "Select Dependency" popup in STS 4. Click OK 5. Save pom.xml Once saved, my maven directory on hard drive and maven dependency setting in STS is updated within seconds. You can edit the .xml directly, but using the ...
JdbcTemplate queryForInt/Long is deprecated in Spring 3.2.2. What should it be replaced by?
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public int getCircleCount() {
Object param = "1";
String sql = "select count(*) from circle where id = ? ";
jdbcTemplate.setDataSource(getDataSource());
int result = getJdbcTemplate().queryForObject(sql, new Object[] { param }, Integer.class);
return result;
}
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