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How to use the 'sweep' function
...ation defined by FUN.
For instance, if you want to add 1 to the 1st row, 2 to the 2nd, etc. of the matrix you defined, you will do:
sweep (M, 1, c(1: 4), "+")
I frankly did not understand the definition in the R documentation either, I just learned by looking up examples.
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Truncate number to two decimal places without rounding
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How do I delete rows in a data frame?
...he '-' operator.
So, assuming the data.frame is called myData:
myData[-c(2, 4, 6), ] # notice the -
Of course, don't forget to "reassign" myData if you wanted to drop those rows entirely---otherwise, R just prints the results.
myData <- myData[-c(2, 4, 6), ]
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How do I merge a list of dicts into a single dict?
... d in L:
... result.update(d)
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>>> result
{'a':1,'c':1,'b':2,'d':2}
As a comprehension:
# Python >= 2.7
{k: v for d in L for k, v in d.items()}
# Python < 2.7
dict(pair for d in L for pair in d.items())
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If vs. Switch Speed
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answered Jan 14 '09 at 23:16
Konrad RudolphKonrad Rudolph
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C# LINQ find duplicates in List
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edited Mar 28 '18 at 5:05
Vadim Ovchinnikov
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What is the leading LINQ for JavaScript library? [closed]
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answered Mar 19 '10 at 21:17
Richard Anthony HeinRichard Anthony Hein
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win7 安装项目管理工具redmine2.5.1 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
win7 安装项目管理工具redmine2.5.1〇、选择redmine最近项目中需要用到一个bug tracker工具，在摇摆不定之后，最终选了redmine，在此之前，我还没有搭建过类似的管理工具，现...〇、选择redmine
最近项目中需要用到一个bug tracker工具，...
Using getopts to process long and short command line options
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Android WebView style background-color:transparent ignored on android 2.2
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