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dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
...drop=FALSE) %>% tally
#> Species n
#> 1 setosa 50
#> 2 versicolor 50
#> 3 virginica 50
#> 4 empty_level 0
# Add character column
iris$group2 = c(rep(c("A","B"), 50), rep(c("B","C"), each=25))
# Empty groups involving combinations of Species and gro...
Difference between return and exit in Bash functions
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edited Sep 28 '18 at 8:50
The_Modeler
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answered Dec 12 '10 at 1:29
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mfc里面的140种颜色宏 - C/C++ - 清泛网 - 专注C/C++及内核技术
...211) // 暗紫罗兰
#define CLR_DARKORCHID RGB(153, 50, 204) // 暗兰花紫
#define CLR_INDIGO RGB( 75, 0, 130) // 靛青 (紫兰色)
#define CLR_BLUEVIOLET RGB(138, 43, 226) // 蓝紫罗兰
#define CLR_MEDIUMPURPLE ...
Why do results vary based on curly brace placement?
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answered Sep 4 '10 at 8:50
ResiduumResiduum
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MySQL - UPDATE multiple rows with different values in one query
...to update
CREATE TEMPORARY TABLE temp_table_users
(
cod_user varchar(50)
, date varchar(50)
, user_rol varchar(50)
, cod_office varchar(50)
) ENGINE=MEMORY
Step 2: Insert the values into the temp table
Step 3: Update the original table
UPDATE table_users t1
JOIN temp_table_use...
Best way to reverse a string
...) and build a new string with a StringBuilder.
– user502255
Jul 9 '16 at 4:03
2
It's a bit strang...
Bash tool to get nth line from a file
...avaanubhava
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45
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Database Design for Revisions?
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SELECT EmployeeId, RevisionXML.value('(/employee/FirstName)[1]', 'varchar(50)') AS FirstName,
RevisionXML.value('(/employee/LastName)[1]', 'varchar(100)') AS LastName,
RevisionXML.value('(/employee/DepartmentId)[1]', 'integer') AS DepartmentId,
FROM EmployeeHistories
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How do I make UITableViewCell's ImageView a fixed size even when the image is smaller
...h of images I am using for cell's image views, they are all no bigger than 50x50. e.g. 40x50, 50x32, 20x37 .....
16 Answ...