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Principal component analysis in Python
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Months later, here's a small class PCA, and a picture:
#!/usr/bin/env python
""" a small class for Principal Component Analysis
Usage:
p = PCA( A, fraction=0.90 )
In:
A: an array of e.g. 1000 observations x 20 variables, 1000 rows x 20 columns
fraction: use principal components that...
那些年 O2O创业我踩了十个坑 - 资讯 - 清泛网 - 专注C/C++及内核技术
...的系统，我们的计划是做半年后，大约到2015年10月份，等数据上到一定的台阶，再去拉下轮新的融资。
可带给我们很大打击的是，我们行业内的竞争对手在8月份宣布，拿到了一亿美金的B轮融资，而且还是百度战略投资。
如果...
How does collections.defaultdict work?
I've read the examples in python docs, but still can't figure out what this method means. Can somebody help? Here are two examples from the python docs
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How to deep copy a list?
...ist.
deepcopy(x, memo=None, _nil=[])
Deep copy operation on arbitrary Python objects.
See the following snippet -
>>> a = [[1, 2, 3], [4, 5, 6]]
>>> b = list(a)
>>> a
[[1, 2, 3], [4, 5, 6]]
>>> b
[[1, 2, 3], [4, 5, 6]]
>>> a[0][1] = 10
>>&g...
Iterate a list with indexes in Python
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python enumerate function will be satisfied your requirements
result = list(enumerate([1,3,7,12]))
print result
output
[(0, 1), (1, 3), (2, 7),(3,12)]
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How can I compare two lists in python and return matches
I want to take two lists and find the values that appear in both.
19 Answers
19
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Can modules have properties the same way that objects can?
With python properties, I can make it such that
6 Answers
6
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What is pip's equivalent of `npm install package --save-dev`?
...ject with an existing requirements.txt, installing all requirements (I use Python3.7 but you can remove the --three if you do not) is as simple as:
pipenv --three install
Activating the virtualenv to run commands is also easy
pipenv shell
Installing requirements will automatically update the P...
Python base64 data decode
I have the following piece of base64 encoded data, and I want to use python base64 module to extract information from it. It seems that module does not work. Can anyone tell me how?
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LaTeX package for syntax highlighting of code in various languages
...require jumping through a dozen hoops, upgrading to MiKTeX 2.8, installing Python, installing other components and so on. Minted documentation is poor and it doesn't support breaking long lines. But eventually I got it to render Java/XML in Eclipse colours! jevon.org/wiki/Eclipse_Pygments_Style
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