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Automatically expanding an R factor into a collection of 1/0 indicator variables for every factor le
...level, there is an associated column in a new data frame, which contains a 1/0 indicator. E.g., suppose I have:
8 Answers
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搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
...机器数量为至少3个，那我们也按照这个数量配置测试。
1、准备两台机器 192.168.1.136、192.168.1.137、192.168.1.138。 192.168.1.136 当作副本集主节点，192.168.1.137、192.168.1.138作为副本集副本节点。
2、分别在每台机器上建立mongodb副本集...
What is the easiest way to remove the first character from a string?
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15 Answers
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Understanding the Use of ColorMatrix and ColorMatrixColorFilter to Modify a Drawable's Hue
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10 Answers
10
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Adding a column to a data.frame
... below. I want to add a column that classifies my data according to column 1 ( h_no ) in that way that the first series of h_no 1,2,3,4 is class 1, the second series of h_no (1 to 7) is class 2 etc. such as indicated in the last column.
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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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