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Importing data from a JSON file into R
... answered Sep 4 '14 at 21:51
xn.xn.
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推荐系统算法初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...记录等数据，得到如下表：
表中的行是一种物品，x1~xn是影响用户行为的各种特征属性，如用户年龄段、性别、地域、物品的价格、类别等等，y则是用户对于该物品的喜好程度，可以是购买记录、浏览、收藏等等。通过大量...
Difference between break and continue statement
... answered Jan 20 '09 at 18:02
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How to grab substring before a specified character jQuery or JavaScript
...ace for definitive information on what each method does (mozilla developer network is better for that) w3schools.com is good for introducing you to syntax.
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How do I put a clear button inside my HTML text input box like the iPhone does?
... height: 16px;
background: url('http://cdn.sstatic.net/stackoverflow/img/sprites.png?v=4') 0 -690px;
cursor: pointer;
}
span.deleteicon input {
padding-right: 16px;
box-sizing: border-box;
}
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SVG drop shadow using css3
...s, of course. Here's an example of one way of doing that, xn--dahlstrm-t4a.net/svg/filters/…. Just vary the slope attribute to tweak how much opacity you want.
– Erik Dahlström
Mar 21 '12 at 9:05
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How to validate an email address in PHP
...x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22)))*@(?:(?:(?!.*[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-+[a-z0-9]+)*\\.){1,126}){1,}(?:(?:[a-z][a-z0-9]*)|(?:(?:xn--)[a-z0-9]+))(?:-+[a-z0-9]+)*)|(?:\\[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|(?:(?!(?:.*[a-f0-9][:\\]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-...
For loop for HTMLCollection elements
... iteration simply won't work for an HTMLCollection.
See http://jsfiddle.net/jfriend00/FzZ2H/ for why you can't iterate an HTMLCollection with for/in.
In Firefox, your for/in iteration would return these items (all the iterable properties of the object):
0
1
2
item
namedItem
@@iterator
length
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Data structure for loaded dice?
...cumulative for each die value, you could create an integer array of length xN, where x is ideally a high number to increase accuracy of the probability.
Populate this array using the index (normalized by xN) as the cumulative value and, in each 'slot' in the array, store the would-be dice roll if t...
How to determine if a list of polygon points are in clockwise order?
...alculate the signed area:
A = 1/2 * (x1*y2 - x2*y1 + x2*y3 - x3*y2 + ... + xn*y1 - x1*yn)
Or in pseudo-code:
signedArea = 0
for each point in points:
x1 = point[0]
y1 = point[1]
if point is last point
x2 = firstPoint[0]
y2 = firstPoint[1]
else
x2 = nextPoint...