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Summarizing multiple columns with dplyr? [duplicate]
...;int> <dbl> <dbl> <dbl> <dbl>
#> 1 1 3.08 2.98 2.98 2.91
#> 2 2 3.03 3.04 2.97 2.87
#> 3 3 2.85 2.95 2.95 3.06
If you want to summarize only certain columns, use summarise_at or summarise_if functions.
Alternatively, the purrrlyr package p...
C Macro definition to determine big endian or little endian machine?
...32_H
#include <limits.h>
#include <stdint.h>
#if CHAR_BIT != 8
#error "unsupported char size"
#endif
enum
{
O32_LITTLE_ENDIAN = 0x03020100ul,
O32_BIG_ENDIAN = 0x00010203ul,
O32_PDP_ENDIAN = 0x01000302ul, /* DEC PDP-11 (aka ENDIAN_LITTLE_WORD) */
O32_HONEYWELL_ENDI...
How to change the default charset of a MySQL table?
... query will be:
ALTER TABLE etape_prospection CONVERT TO CHARACTER SET utf8;
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How to check if all list items have the same value and return it, or return an “otherValue” if they
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answered Dec 8 '10 at 17:32
KeithSKeithS
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How to change Android version and code version number?
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answered Mar 8 '14 at 20:35
Ajay SAjay S
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Enable Vim Syntax Highlighting By Default
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answered Jun 30 '12 at 8:00
Ilmo EuroIlmo Euro
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搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...好了，安装软件！
1、准备机器，IP分别设置为： 192.168.0.136、192.168.0.137、192.168.0.138。
2、分别在每台机器上建立mongodb分片对应测试文件夹。
#存放mongodb数据文件
mkdir -p /data/mongodbtest
#进入mongodb文件夹
cd /data/mongodbtest
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How to clear the cache in NetBeans
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edited Feb 9 '18 at 23:20
Dave Jarvis
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Using Mockito's generic “any()” method
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Since Java 8 you can use the argument-less any method and the type argument will get inferred by the compiler:
verify(bar).doStuff(any());
Explanation
The new thing in Java 8 is that the target type of an expression will be used t...