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How to calculate a logistic sigmoid function in Python?
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226
This should do it:
import math
def sigmoid(x):
return 1 / (1 + math.exp(-x))
And now you...
INSERT with SELECT
...(name, location, gid)
SELECT name, location, 1
FROM courses
WHERE cid = 2
You can put a constant of the same type as gid in its place, not just 1, of course. And, I just made up the cid value.
share
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Best data type for storing currency values in a MySQL database
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229
Something like Decimal(19,4) usually works pretty well in most cases. You can adjust the scale...
Is there any pythonic way to combine two dicts (adding values for keys that appear in both)?
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842
Use collections.Counter:
>>> from collections import Counter
>>> A = Counter(...
Using Case/Switch and GetType to determine the object [duplicate]
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answered Apr 2 '09 at 9:10
Anton GogolevAnton Gogolev
105k3636 gold badges187187 silver badges274274 bronze badges
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Regex: match everything but specific pattern
...fic pattern (specifically index.php and what follows, like index.php?id=2342343 )
7 Answers
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使用App Inventor扩展实现多点触控：Scale Detector · App Inventor 2 中文网
...助”->“伴侣信息”以下载该伴侣。 当你切换回普通的AI2服务器时，你需要重新安装普通的伴侣。
你可以使用扩展测试服务器按照下面第 2 部分中的描述实施 ScaleDetector.aix 扩展。
请记住，扩展机制仍然不稳定并且正在开发...
How do you do a simple “chmod +x” from within python?
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201
Use os.stat() to get the current permissions, use | to or the bits together, and use os.chmod(...
Creating a new column based on if-elif-else condition
... passing in the axis=1 option:
In [1]: df['C'] = df.apply(f, axis=1)
In [2]: df
Out[2]:
A B C
a 2 2 0
b 3 1 1
c 1 3 -1
Of course, this is not vectorized so performance may not be as good when scaled to a large number of records. Still, I think it is much more readable. Especially c...
How can I delay a method call for 1 second?
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256
performSelector:withObject:afterDelay:
Document Reference
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