大约有 41,310 项符合查询结果（耗时：0.0436秒） [XML]
Find row where values for column is maximal in a pandas DataFrame
...t; import numpy as np
>>> df = pandas.DataFrame(np.random.randn(5,3),columns=['A','B','C'])
>>> df
A B C
0 1.232853 -1.979459 -0.573626
1 0.140767 0.394940 1.068890
2 0.742023 1.343977 -0.579745
3 2.125299 -0.649328 -0.211692
4 -0.187253 1.908618 -...
Checking for the correct number of arguments
...
3 Answers
3
Active
...
Why does the default parameterless constructor go away when you create one with parameters
...
answered Aug 3 '12 at 8:43
Dan PuzeyDan Puzey
31.1k33 gold badges6666 silver badges9393 bronze badges
...
Remove duplicated rows
...only need the first three columns
deduped.data <- unique( yourdata[ , 1:3 ] )
# the fourth column no longer 'distinguishes' them,
# so they're duplicates and thrown out.
share
|
improve this an...
How to convert int to NSString?
... Hemang
25.2k1717 gold badges106106 silver badges163163 bronze badges
answered Apr 10 '13 at 21:54
VisioNVisioN
127k2626 gold bad...
`staticmethod` and `abc.abstractmethod`: Will it blend?
...
35
class abstractstatic(staticmethod):
__slots__ = ()
def __init__(self, function):
...
What does -> mean in Python function definitions?
I've recently noticed something interesting when looking at Python 3.3 grammar specification :
7 Answers
...
How do I append one string to another in Python?
...hon -m timeit -s"s=''" "for i in xrange(10):s+='a'"
1000000 loops, best of 3: 1.85 usec per loop
$ python -m timeit -s"s=''" "for i in xrange(100):s+='a'"
10000 loops, best of 3: 16.8 usec per loop
$ python -m timeit -s"s=''" "for i in xrange(1000):s+='a'"
10000 loops, best of 3: 158 usec per loop
$...
How do I convert a float number to a whole number in JavaScript?
...74099 900719925474099 900719925474099
value | 0 // 858993459 858993459 858993459
~~value // 858993459 858993459 858993459
value >> 0 // 858993459 858993459 858993459
value >>> 0 ...
while (1) Vs. for (;;) Is there a speed difference?
...1 <0> enter ->2
2 <;> nextstate(main 2 -e:1) v ->3
9 <2> leaveloop vK/2 ->a
3 <{> enterloop(next->8 last->9 redo->4) v ->4
- <@> lineseq vK ->9
4 <;> nextstate(main 1 -e:1) v ->5
7 <@> ...