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Drop data frame columns by name
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You can use a simple list of names :
DF <- data.frame(
x=1:10,
y=10:1,
z=rep(5,10),
a=11:20
)
drops <- c("x","z")
DF[ , !(names(DF) %in% drops)]
Or, alternatively, you can make a list of those to keep and refer to them by name :
keeps <- c("y", "a")
DF[keeps]
EDIT ...
What MySQL data type should be used for Latitude/Longitude with 8 decimal places?
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610
DECIMAL is the MySQL data-type for exact arithmetic. Unlike FLOAT its precision is fixed for an...
How to get the clicked link's href with jquery?
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175
this in your callback function refers to the clicked element.
$(".addressClick").click(fun...
使用CSplitterWnd实现拆分窗口（多视图显示） - C/C++ - 清泛网 - 专注C/C++及内核技术
...用户可以缩放各行各列。一个静态拆分窗口最多可以包含16行16列。
要找一个使用了静态拆分窗口的应用程序，只要看一下windows管理器即可。
动态拆分窗口最多可以有两行两列，但它们可以相互拆分和合并。Vc就使用了动态拆...
Generate fixed length Strings filled with whitespaces
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13 Answers
13
Active
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How to use ArrayAdapter
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156
Implement custom adapter for your class:
public class MyClassAdapter extends ArrayAdapter<...
TypeError: got multiple values for argument
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edited May 31 '16 at 5:51
arogachev
31.1k66 gold badges100100 silver badges112112 bronze badges
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How to limit UITableView row reordering to a section
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181
This implementation will prevent re-ordering outside of the original section like Phil's answe...
Most efficient way to make the first character of a String lower case?
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11 Answers
11
Active
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Inserting HTML into a div
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180
I think this is what you want:
document.getElementById('tag-id').innerHTML = '<ol><...