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Calculating Pearson correlation and significance in Python
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@user702846 Pearson correlation is defined on a 2xN matrix. There is no generally applicable method that converts two dictionaries into a 2xN matrix, but you might use the array of pairs of dictionary values corresponding to the keys of the intersection of the keys of your ...
How does C compute sin() and other math functions?
I've been poring through .NET disassemblies and the GCC source code, but can't seem to find anywhere the actual implementation of sin() and other math functions... they always seem to be referencing something else.
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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...
Drawing an SVG file on a HTML5 canvas
...images/logo.svg as the first available SVG I found. Worked in FF. jsfiddle.net/Na6X5/331
– Thomas
Mar 10 '15 at 4:24
1
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How can Perl's print add a newline by default?
...or use Modern::Perl to get the built in say feature, I'm going to pimp perl5i which turns on a lot of sensible missing Perl 5 features by default.
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Rails ActiveRecord date between
... Ok but from the form I get this: {"written_at(4i)"=>"18", "written_at(5i)"=>"56", "content"=>"rrrrrr", "written_at(1i)"=>"2010", "written_at(2i)"=>"5", "written_at(3i)"=>"4"} How can I build an object to use beginning_of_day?
– rtacconi
Mar...
Difference between break and continue statement
... answered Jan 20 '09 at 18:02
Xn0vv3rXn0vv3r
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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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