大约有 43,000 项符合查询结果（耗时：0.0320秒） [XML]
Algorithm for creating a school timetable
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edited Feb 1 '10 at 17:46
answered Feb 1 '10 at 17:11
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Replace duplicate spaces with a single space in T-SQL
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answered Mar 16 '10 at 15:51
Neil KnightNeil Knight
42.9k2222 gold badges116116 silver badges184184 bronze badges
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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 [...
如何选择机器学习算法 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...验证中表现最好的。jmp0xf 译自Edwin Chen
How do you know what machine learning algorithm to choose for your classification problem? Of course, if you really care about accuracy, your best bet is to test out a couple different ones (making sure to try different parameters within each alg...
Scala: Abstract types vs generics
...r in a moment.
– VonC
Jul 22 '09 at 10:44
1
Note to self: see also this May 2010 blog post: daily...
How do I fix "The expression of type List needs unchecked conversion…'?
...solution.
– Bruno De Fraine
May 17 '10 at 10:31
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General guidelines to avoid memory leaks in C++ [closed]
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I wish I could give this a +10. This is the biggest problem I see with most C++ programmers today, and I assume it is because they learned Java before C++.
– Kristopher Johnson
Jun 28 '09 at 15:37
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Does Java 8 provide a good way to repeat a value or function?
...ewer version of the javadoc (you are pointing to build 78, latest is build 105: download.java.net/lambda/b105/docs/api/java/util/stream/… )
– Mark Rotteveel
Aug 30 '13 at 12:22
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Why does the CheckBoxFor render an additional input tag, and how can I get the value using the FormC
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answered May 18 '10 at 20:37
Robert HarveyRobert Harvey
164k4141 gold badges308308 silver badges467467 bronze badges
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