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How to drop columns by name in a data frame
...y) ),
times=5000)
plt <- ggplot2::qplot(y=time, data=res[res$time < 1000000,], colour=expr)
plt <- plt + ggplot2::scale_y_log10() +
ggplot2::labs(colour = "expression") +
ggplot2::scale_color_discrete(labels = c("re_assign", "null_assign", "subset_bool", "subset_names", "subset_drop"...
How does Java handle integer underflows and overflows and how would you check for it?
... Let's say the maximum and minimum values that Java allows for an int are +100, -100, respectively. If you were adding one to a Java integer, the process would look like this as it overflowed. 98, 99, 100, -100, -99, -98, .... Does that make more sense?
– Austin A
...
Can jQuery provide the tag name?
...don't just have a small selection of possible tags, but it could be any of 100+ html tags. Then you'd need to write: $(this).is('sometag') a 100+ times. I assume this is why some people downvoted your answer.
– ximi
Mar 1 '12 at 20:09
...
Retain precision with double in Java
...lt of 5.6 + 5.8.
When requiring a value that is exact, such as 1.5 or 150.1005, you'll want to use one of the fixed-point types, which will be able to represent the number exactly.
As has been mentioned several times already, Java has a BigDecimal class which will handle very large numbers and ver...
The application may be doing too much work on its main thread
... android
emulator and the number of frames skipped are fairly small (<100) then
you can take a safe bet of the emulator being slow – which happens
almost all the times. But if the number of frames skipped and large
and in the order of 300+ then there can be some serious trouble with
y...
How to get these two divs side-by-side?
...
#parent_div_1, #parent_div_2, #parent_div_3 {
width: 100px;
height: 100px;
border: 1px solid red;
margin-right: 10px;
float: left;
}
.child_div_1 {
float: left;
margin-right: 5px;
}
Check working example at http://jsfiddle.net/c6242/1/
...
Blocks and yields in Ruby
...r/bin/ruby
def test
yield 5
puts "You are in the method test"
yield 100
end
test {|i| puts "You are in the block #{i}"}
test do |i|
puts "You are in the block #{i}"
end
which should give the following output:
You are in the block 5
You are in the method test
You are in the block 100
...
Make fill entire screen?
...
html, body {
margin: 0;
height: 100%;
}
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指定组件的大小 · App Inventor 2 中文网
...’s Width property is set to Automatic and it is empty, the width will be 100.
If a VerticalArrangement’s Height property is set to Automatic, the actual height of the arrangement is determined by the sum of the heights of the components. If a VerticalArrangement’s Height property is set to Au...
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...毕业学校、工作单位、家庭状况。一些网站最厉害的问你100个问题，什么喜欢的颜色，食物，运动，偶像，喜欢看的书类型，然后开始关联账号，微信，微博，比如微博、微信等社交媒体的内容及更新频率，QQ登录及在线时间，...