大约有 45,000 项符合查询结果（耗时：0.0355秒） [XML]
Split string every nth character?
...
>>> line = '1234567890'
>>> n = 2
>>> [line[i:i+n] for i in range(0, len(line), n)]
['12', '34', '56', '78', '90']
share
|
...
How can I create a correlation matrix in R?
I have 92 set of data of same type.
5 Answers
5
...
How to get first element in a list of tuples?
...
12 Answers
12
Active
...
How to split a delimited string in Ruby and convert it to an array?
...
>> "1,2,3,4".split(",")
=> ["1", "2", "3", "4"]
Or for integers:
>> "1,2,3,4".split(",").map { |s| s.to_i }
=> [1, 2, 3, 4]
Or for later versions of ruby (>= 1.9 - as pointed out by Alex):
>> "1,2,3,4".sp...
How to do exponential and logarithmic curve fitting in Python? I found only polynomial fitting
...
230
For fitting y = A + B log x, just fit y against (log x).
>>> x = numpy.array([1, 7, ...
count the frequency that a value occurs in a dataframe column
...ame({'a':list('abssbab')})
df.groupby('a').count()
Out[37]:
a
a
a 2
b 3
s 2
[3 rows x 1 columns]
See the online docs: http://pandas.pydata.org/pandas-docs/stable/groupby.html
Also value_counts() as @DSM has commented, many ways to skin a cat here
In [38]:
df['a'].value_counts()
Out[...
How to check if a string contains a substring in Bash
...
26 Answers
26
Active
...
Maximum length for MySQL type text
...
772
See for maximum numbers:
http://dev.mysql.com/doc/refman/5.0/en/storage-requirements.html
TINYB...
Best way to represent a fraction in Java?
...
26 Answers
26
Active
...
Which is better option to use for dividing an integer number by 2?
... of the following techniques is the best option for dividing an integer by 2 and why?
23 Answers
...