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Mapping two integers to one, in a unique and deterministic way
...sy to define a bijection f : Z -> N, like so:
f(n) = n * 2 if n >= 0
f(n) = -n * 2 - 1 if n < 0
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Fastest hash for non-cryptographic uses?
...because of the reduced length (32 bits compared to 128 bits respectively 160 bits). But if you just want to check whether a stored string is corrupted, you'll be fine with CRC32.
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Python Infinity - Any caveats?
...-a-number (NaN) values from simple arithmetic involving inf:
>>> 0 * float("inf")
nan
Note that you will normally not get an inf value through usual arithmetic calculations:
>>> 2.0**2
4.0
>>> _**2
16.0
>>> _**2
256.0
>>> _**2
65536.0
>>> _**...
Creating a Pandas DataFrame from a Numpy array: How do I specify the index column and column headers
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350
You need to specify data, index and columns to DataFrame constructor, as in:
>>> pd.Da...
Is there a float input type in HTML5?
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+50
The number type has a step value controlling which numbers are valid (along with max and min), which defaults to 1. This value is also...
Similarity String Comparison in Java
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answered Jun 5 '09 at 9:59
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Can a class member function template be virtual?
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answered Mar 1 '10 at 8:52
sbisbi
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MongoDB sort排序、index索引教程 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...果。
实例
col 集合中的数据如下：
{ "_id" : ObjectId("56066542ade2f21f36b0313a"), "title" : "PHP 教程", "description" : "PHP 是一种创建动态交互性站点的强有力的服务器端脚本语言。", "by" : "菜鸟教程", "url" : "https://www.tsingfun.com", "tags" : [ "php"...
Calculating Pearson correlation and significance in Python
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201
You can have a look at scipy.stats:
from pydoc import help
from scipy.stats.stats import pears...
Generating random whole numbers in JavaScript in a specific range?
...d it. It's a simple rule of three:
Math.random() returns a Number between 0 (inclusive) and 1 (exclusive). So we have an interval like this:
[0 .................................... 1)
Now, we'd like a number between min (inclusive) and max (exclusive):
[0 .................................... 1)...