大约有 44,700 项符合查询结果（耗时：0.0412秒） [XML]
Numpy where function multiple conditions
...
204
The best way in your particular case would just be to change your two criteria to one criterio...
Ignoring new fields on JSON objects using Jackson [duplicate]
...
12 Answers
12
Active
...
How can I create a correlation matrix in R?
I have 92 set of data of same type.
5 Answers
5
...
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 to get first element in a list of tuples?
...
12 Answers
12
Active
...
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, ...
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...
Best way to represent a fraction in Java?
...
26 Answers
26
Active
...
How to check if a string contains a substring in Bash
...
26 Answers
26
Active
...
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[...