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App Inventor 2 过滤蓝牙设备列表 · App Inventor 2 中文网
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使用蓝牙客户端时：
它返回的设备地址列表就是一个列表对象，直接遍历，然后收集符合我们过滤条件的地址，放入新的列表，最后显示新列表，参考代码如下：
使用BluetoothLE拓展时：
它返回的不是列...
APP INVENTOR硬件交互学习教程05——自动连接蓝牙实现 - 创客硬件开发 - 清...
...择蓝牙，用起来很麻烦。有没有方法实现自动连接上次的地址呢，接下来请看吧！
1.界面设计增加了一个微数据库组件，借助它用来存储硬件地址
2.程序设计
这里主要用两个方法，存储地址方法；读取地址方法。具体代码请...
The smallest difference between 2 Angles
...targetA - sourceA
a = (a + 180) % 360 - 180
Beware in many languages the modulo operation returns a value with the same sign as the dividend (like C, C++, C#, JavaScript, full list here). This requires a custom mod function like so:
mod = (a, n) -> a - floor(a/n) * n
Or so:
mod = (a, n) -&g...
Can you add new statements to Python's syntax?
... do here, really, is gain some insight into the inner workings of Python.
Modifying the grammar
Python uses a custom parser generator named pgen. This is a LL(1) parser that converts Python source code into a parse tree. The input to the parser generator is the file Grammar/Grammar[1]. This is a s...
Java内存泄露原因详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...哪种语言的内存分配方式，都需要返回所分配内存的真实地址，也就是返回一个指针到内存块的首地址。Java中对象是采...一、Java内存回收机制
不论哪种语言的内存分配方式，都需要返回所分配内存的真实地址，也就是返回一...
BLE协议—广播和扫描 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...在广播和扫描的基础上进行连接后点对点通信。广播访问地址广播包：广播包Access Address 固定为0x8E89BED6，广播包只能在广播信道（channel）上传输，即只能在37/38/39信道上传输（注：从蓝牙5.0开始广播包可以在其它信道上传输）...
.htaccess not working apache
... that AllowOverride is set correctly. See http://httpd.apache.org/docs/2.4/mod/core.html#allowoverride for details. You need to also ensure that it is set in the correct scope - ie, in the right block in your configuration. Be sure you're NOT editing the one in the block, for example.
Third, if y...
C++静态和多态，亦敌亦友 - C/C++ - 清泛网 - 专注C/C++及内核技术
...程序运行的过程，是“静止”不变，固定的（特别是内存地址），当然“多态”就是与之对立的概念。这一篇我们并不讨论静态（成员）变量或静态（成员）函数有什么作用，而是讨论“静态”的行为，对比“多态”。我们这里...
Python: reload component Y imported with 'from X import Y'?
In Python, once I have imported a module X in an interpreter session using import X , and the module changes on the outside, I can reload the module with reload(X) . The changes then become available in my interpreter session.
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How to succinctly write a formula with many variables from a data frame?
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d <- data.frame(y = y, x1 = c(4,-1,3), x2 = c(3,9,8), x3 = c(4,-4,-2))
mod <- lm(y ~ ., data = d)
You can also do things like this, to use all variables but one (in this case x3 is excluded):
mod <- lm(y ~ . - x3, data = d)
Technically, . means all variables not already mentioned in t...