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Java 8 Streams: multiple filters vs. complex condition
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one filter with predicate of form u -> exp1 && exp2, list size 10000000, averaged over 100 runs: LongSummaryStatistics{count=100, sum=4142, min=29, average=41.420000, max=82}
two filters with predicates of form u -> exp1, list size 10000000, averaged over 100 runs: LongSummaryStatisti...
How to access the last value in a vector?
...last(NumericVector x) { int n = x.size(); return x[n-1]; }')
options(width=100)
for (n in c(1e3,1e4,1e5,1e6,1e7)) {
x <- runif(n);
print(microbenchmark::microbenchmark(x[length(x)],
mylast(x),
tail(x, n=1),
...
从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
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从上面的package情况，我可以粗略地看出推荐引擎分为5个主要部分组成：数据模型，相似度算法，近邻算法，推荐算法，算法评分器。
从数据处理能力上，算法可以分为：单机内存算法，基于hadoop的分步式算法。
下面我们...
How to calculate percentage with a SQL statement
...s does work. The answer by gordyii was close but had the multiplication of 100 in the wrong place and had some missing parenthesis.
Select Grade, (Count(Grade)* 100 / (Select Count(*) From MyTable)) as Score
From MyTable
Group By Grade
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CSS Progress Circle [closed]
...e ones I have been able to found show animated circles that go to the full 100%.
4 Answers
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How to write a caption under an image?
...t;
<figure>
<img src="http://lorempixel.com/100/100/nature/1/" width="100px" height="100px" />
<figcaption>First image</figcaption>
</figure>
</a>
<a href="#">
<figure>
<im...
How can I do width = 100% - 100px in CSS?
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Modern browsers now support the:
width: calc(100% - 100px);
To see the list of supported browser versions checkout: Can I use calc() as CSS unit value?
There is a jQuery fallback: css width: calc(100% -100px); alternative using jquery
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HTML5 canvas ctx.fillText won't do line breaks?
...e last line.";
var lh = 12;
ctx.lineWidth = 1;
ctx.mlFillText(T, 10, 10, 100, 100, 'top', 'left', lh);
ctx.strokeRect(10, 10, 100, 100);
ctx.mlFillText(T, 110, 10, 100, 100, 'top', 'center', lh);
ctx.strokeRect(110, 10, 100, 100);
ctx.mlFillText(T, 210, 10, 100, 100, 'top', 'right', lh);
ctx.str...
Write a program to find 100 largest numbers out of an array of 1 billion numbers
... recently attended an interview where I was asked "write a program to find 100 largest numbers out of an array of 1 billion numbers."
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Putting an if-elif-else statement on one line?
...ator does work, but I still think that it's less readable:
>>> i=100
>>> a = 1 if i<100 else 2 if i>100 else 0
>>> a
0
>>> i=101
>>> a = 1 if i<100 else 2 if i>100 else 0
>>> a
2
>>> i=99
>>> a = 1 if i<100 else ...