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导盲项目：什么场景非得用相机预览？按杖上按钮或定时拍照，识别后语音提醒...
...不靠人按快门、由程序决定什么时候拍」的场景，都要用实时预览录制的预览模式拍照。 导盲正是这种：按的是杖上的按钮、或者计时器到点，没有人去点手机屏幕上的快门。
三种拍照方式，导盲该用哪种
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Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术
Excel RTD(Excel Real-Time Data)实时刷新数据技术从Excel 2002开始，微软提供了一种叫做Excel RTD（real-time data）的技术，使用该技术可以在Excel中实时查看和更新数据。RTD采用所谓的...从Excel 2002开始，微软提供了一种叫做Excel RTD（real-time d...
Find nearest value in numpy array
...n. I wonder why it is so slow anyways. Plain np.searchsorted takes about 2 µs for my test set, the whole function about 10 µs. Using np.abs it's getting even worse. No clue what python is doing there.
– Michael
Feb 17 '15 at 18:07
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App Inventor 2 EV3超声波传感器教程 · App Inventor 2 中文网
...ient = 蓝牙客户端1
EV3超声波传感器1.SensorPort = "4" // EV3端口4
计时器_读取.TimerEnabled = true
}
}
读取超声波距离
连续读取
计时器_读取.TimerInterval = 200 // 200ms读取一次
when 计时器_读取.Time...
Why does modern Perl avoid UTF-8 by default?
..., we got 12. Perl assumed that we were operating on the Latin-1 string "æååã" (which is 12 characters, some of which are non-printing).
This is called an "implicit upgrade", and it's a perfectly reasonable thing to do, but it's not what you want if your text is not Latin-1. That's why it's c...
Is it possible to use argsort in descending order?
...00)
>>> n = 30
>>> timeit (-avgDists).argsort()[:n]
1.93 µs ± 6.68 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
>>> timeit avgDists.argsort()[::-1][:n]
1.64 µs ± 3.39 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
>>> timeit avg...
数据实时刷新技术，DDE or RTD？ - 其他 - 清泛IT社区，为创新赋能！
从Excel 2002开始，Excel引入了一种新的查看和更新实时数据的机制，即real-time data简称RTD函数，他是一种Push-Pull的方式，及在需要更新数据的时候，RTD给Excel Push一个消息说要更新数据，Excel在收到消息后主动拉取Pull新的数据。RTD函...
Getting indices of True values in a boolean list
...;> %timeit list(compress(xrange(len(t)), t))
1000 loops, best of 3: 696 µs per loop
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Windows、Linux开放指定端口 - 更多技术 - 清泛网 - 专注C/C++及内核技术
Windows、Linux开放指定端口主机某些端口需要提供给外部访问，如MySQL 3306端口、svn 3690端口、WCF绑定端口等等，但一般情况下端口默认是被防火墙拦截禁止外部访问的。本文简要介绍了如何在不关闭防火墙的情况下开放指定端口。...
How do I copy a string to the clipboard on Windows using Python?
...ndows default encoding. Allowed me to load this to the clipboard "másreas ç saod é í ó u* ü ö ï/" and read it back correctly.
– mvbentes
May 12 '16 at 17:18
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