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App Inventor 2 SliderVertical 扩展：垂直的滑动条 · App Inventor 2 中文网
... 教育 入门必读 中文教程 IoT专题 AI2拓展 ChatGPT接入 Aia Store 开通VIP 搜索 App Inventor 2 SliderVertical 扩展：垂直...
App Inventor 2 标签内容过多，如何做到可上下滑动？ · App Inventor 2 中文网
... 教育 入门必读 中文教程 IoT专题 AI2拓展 ChatGPT接入 Aia Store 开通VIP 搜索 App Inventor 2 标签内容过多，如何做...
How can I remove a specific item from an array?
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Easy way to list node modules I have npm linked?
...symlinks, you could try something like find / -type d -name "node_modules" 2>/dev/null | xargs -I{} find {} -type l -maxdepth 1 | xargs ls -l.
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How to check if element in groovy array/hash/collection/list?
...n array contains an element?
I thought there might be something like [1, 2, 3].includes(1) which would evaluate as true .
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How to reverse a singly linked list using only two pointers?
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Sort a list by multiple attributes?
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A key can be a function that returns a tuple:
s = sorted(s, key = lambda x: (x[1], x[2]))
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Why does the indexing start with zero in 'C'?
...be denoted as array[0].
For more info:
http://developeronline.blogspot.com/2008/04/why-array-index-should-start-from-0.html
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How can I get a list of locally installed Python modules?
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Pass a data.frame column name to a function
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You can just use the column name directly:
df <- data.frame(A=1:10, B=2:11, C=3:12)
fun1 <- function(x, column){
max(x[,column])
}
fun1(df, "B")
fun1(df, c("B","A"))
There's no need to use substitute, eval, etc.
You can even pass the desired function as a parameter:
fun1 <- function...