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App Inventor 2 实现蓝牙未开启时弹窗提醒用户开启蓝牙 · 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 实现蓝牙未开启时弹窗...
App Inventor 2 MQTT拓展入门（保姆级教程） · App Inventor 2 中文网
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App Inventor 2 MQTT拓展入门（保姆级...
How to install plugins to Sublime Text 2 editor?
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182
You should have a Data/Packages folder in your Sublime Text 2 install directory.
All you need to...
How to put spacing between TBODY elements
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12 Answers
12
Active
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What algorithm can be used for packing rectangles of different sizes into the smallest rectangle pos
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2
I had a hard time trying to imagine how optimal this could work. So I've coded it (with a square shape) and the results are great. Here's a ...
Dynamically select data frame columns using $ and a character value
...s a reproducible example below:
# set seed for reproducibility
set.seed(123)
df <- data.frame( col1 = sample(5,10,repl=T) , col2 = sample(5,10,repl=T) , col3 = sample(5,10,repl=T) )
# We want to sort by 'col3' then by 'col1'
sort_list <- c("col3","col1")
# Use 'do.call' to call order. Se...
How do I do multiple CASE WHEN conditions using SQL Server 2008?
... many WHEN as;
CASE WHEN Col1 = 1 OR Col3 = 1 THEN 1
WHEN Col1 = 2 THEN 2
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ELSE 0 END as Qty
Or a Simple CASE expression
CASE Col1 WHEN 1 THEN 11 WHEN 2 THEN 21 ELSE 13 END
Or CASE within CASE as;
CASE WHEN Col1 < 2 THEN
CASE Col2 WHEN 'X' THE...
Unix command to find lines common in two files
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220
The command you are seeking is comm. eg:-
comm -12 1.sorted.txt 2.sorted.txt
Here:
-1 : su...
Why is there no xrange function in Python3?
... using timeit instead of trying to do it manually with time.
First, Apple 2.7.2 64-bit:
In [37]: %timeit collections.deque((x for x in xrange(10000000) if x%4 == 0), maxlen=0)
1 loops, best of 3: 1.05 s per loop
Now, python.org 3.3.0 64-bit:
In [83]: %timeit collections.deque((x for x in range(...