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Redirect Windows cmd stdout and stderr to a single file
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1111
You want:
dir > a.txt 2>&1
The syntax 2>&1 will redirect 2 (stderr) to 1 ...
Inserting a PDF file in LaTeX
...myfile.pdf}
To include just the first page of a PDF:
\includepdf[pages={1}]{myfile.pdf}
Run texdoc pdfpages in a shell to see the complete manual for pdfpages.
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Underscore: sortBy() based on multiple attributes
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11 Answers
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How to count the number of true elements in a NumPy bool array
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>>> import numpy as np
>>> boolarr = np.array([[0, 0, 1], [1, 0, 1], [1, 0, 1]], dtype=np.bool)
>>> boolarr
array([[False, False, True],
[ True, False, True],
[ True, False, True]], dtype=bool)
>>> np.sum(boolarr)
5
Of course, that is a bool...
Scala @ operator
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180
It enables one to bind a matched pattern to a variable. Consider the following, for instance:
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How many files can I put in a directory?
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Finding duplicates in O(n) time and O(1) space
Input: Given an array of n elements which contains elements from 0 to n-1, with any of these numbers appearing any number of times.
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How is a CRC32 checksum calculated?
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118
The polynomial for CRC32 is:
x32 + x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7 + x5 ...
App Inventor 2 获取手机电池电量与电源状态检测教程 · App Inventor 2 中文网
...示 App
界面设计
积木代码
Screen1 初始化时获取电池信息
电池状态变化时自动更新
手动刷新按钮
示例二：低电量提醒
界面设计
积木代码
定义...