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二进制组件使用指导 · App Inventor 2 中文网
...对一下就知道做对没有。
先懂三件事
1. 字节列表：一串字节就是由 0~255 的数字组成的普通列表，[165, 1, 255]。
列表积木都能用：求长度、取第几个（从 1 数起）、追加。
2. 十六进制：协议文档里的 A5 01 FF 和...
Big-O summary for Java Collections Framework implementations? [closed]
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150
This website is pretty good but not specific to Java: http://bigocheatsheet.com/
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Regular expression to match standard 10 digit phone number
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^(\+\d{1,2}\s)?\(?\d{3}\)?[\s.-]\d{3}[\s.-]\d{4}$
Matches the following
123-456-7890
(123) 4...
What is the equivalent of MATLAB's repmat in NumPy
... execute the equivalent of the following MATLAB code using NumPy: repmat([1; 1], [1 1 1]) . How would I accomplish this?
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Round to at most 2 decimal places (only if necessary)
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How to add multiple files to Git at the same time
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124
To add all the changes you've made:
git add .
To commit them:
git commit -m "MY MESSAGE HER...
How to apply a function to two columns of Pandas dataframe
Suppose I have a df which has columns of 'ID', 'col_1', 'col_2' . And I define a function :
12 Answers
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pandas: How do I split text in a column into multiple rows?
...blocks ItemExt
0 32363 McCartney, Paul 3 F04 2:218:10:4,6 60
1 31316 Lennon, John 25 F01 1:13:36:1,12 1:13:37:1,13 300
In [44]: s = df['Seatblocks'].str.split(' ').apply(Series, 1).stack()
In [45]: s.index = s.index.droplevel(-1) # to line up wi...
How do I make a matrix from a list of vectors in R?
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One option is to use do.call():
> do.call(rbind, a)
[,1] [,2] [,3] [,4] [,5] [,6]
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Remove last item from array
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Use splice(startPosition, deleteCount)
array.splice(-1,1)
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