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Remove duplicated rows using dplyr
...ow:
library(dplyr)
set.seed(123)
df <- data.frame(
x = sample(0:1, 10, replace = T),
y = sample(0:1, 10, replace = T),
z = 1:10
)
One approach would be to group, and then only keep the first row:
df %>% group_by(x, y) %>% filter(row_number(z) == 1)
## Source: local data frame [...
Shared-memory objects in multiprocessing
...''
Singleton Pattern
'''
class SharedNumpyMemManager:
_initSize = 1024
_instance = None
def __new__(cls, *args, **kwargs):
if not cls._instance:
cls._instance = super(SharedNumpyMemManager, cls).__new__(
cls, *args, **kwargs)
...
How to delete duplicates on a MySQL table?
...
answered Apr 13 '10 at 14:52
user187291user187291
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How to write string literals in python without having to escape them?
... Greg HewgillGreg Hewgill
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What exactly is a reentrant function?
...
answered May 9 '10 at 21:37
paercebalpaercebal
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Case-INsensitive Dictionary with string key-type in C#
...Rudolph
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1
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What is the fastest integer division supporting division by zero no matter what the result is?
...
107
Inspired by some of the comments I got rid of the branch on my Pentium and gcc compiler using
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Oracle 11.2.0.4 RAC FOR redhat 6.4 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...lhost localhost.localdomain localhost6 localhost6.localdomain6
172.16.110.100 dmjyrac1
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172.16.110.102 dmjyrac-cluster dmjyrac-cluster-scan
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Possible Loss of Fraction
...ne of the items to a float, you won't get this error.
So for example turn 10 into a 10.0
double returnValue = (myObject.Value / 10.0);
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Multiline bash commands in makefile
...
answered Apr 12 '12 at 10:13
Eldar AbusalimovEldar Abusalimov
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